NY and Westcoast in July for solo traveller

rain systems can generate 15-30 cm of rain in 24 hours

That's a lot ... I've been through 400 mm (40 cm) is ~24 hours in the (mostly un-populated) Northern Australia tropics, and it was unbelievably heavy for a very long time.

Another option for you. Do your homework on the Niagara thing, doesn't seem like a fun place for a single dude, could be wrong?

8 Jul - NYC
9 Jul - NYC
10 Jul - NYC
11 Jul - NYC
12 Jul - SF
13 Jul - Yosemite
14 Jul - Yosemite
15 Jul - Lee Vining or Tom's Place
16 Jul - Las Vegas via Death Valley
17 Jul - Zion
18 Jul - Zion
19 Jul - Grand Canyon
20 Jul - Grand Canyon
21 Jul - Las Vegas
22 Jul - LA
23 Jul - LA
24 Jul - Coast Drive
25 Jul - Coast Drive
26 Jul - SF
27 Jul - SF
28 Jul - SF
29 Jul - NYC
30 Jul - NYC, leave

Might consider getting a www.escapecampervans.com
in SF and camp in Yosemite, Eastern Sierra's, Zion and Grand Canyon, easier to get a camp spot and more fun to stay in the park. Turn the van in at Vegas and get a car for the LA-coast part.
Started you in the west in SF so you can hit Yosemite mid week.

Dear All,

Thank you for your very useful advice's ! I have decided to skip the waterfalls and spend more time on the west coast since i have been to Foz de igazu and i doubt the Niagra will have the same wow factor to it. I also think i would feel much more alone in a camper than using Airbnb (where i can socialise with local people)

I have decided to leave out NOA for another time as i dont want to be flying around so much and would rather spend that time in west coast socializing with the opposite gender :). My revised itinerary below, please comment if you think it can be improved.

8 Jul - NYC
9 Jul - NYC
10 Jul - NYC
11 Jul - NYC
(Fly from NYC to SF)
(Pick up rental car in SF)
12 Jul - SF
13 Jul - Yosemite
14 Jul - Yosemite
15 Jul - Lee Vining or Tom's Place
16 Jul - Las Vegas via Death Valley
17 Jul - Zion
18 Jul - Zion
19 Jul - Grand Canyon
20 Jul - Grand Canyon
21 Jul - Las Vegas
(Fly from Las Vegas to LA)
(Hire new rental car in LA)
22 Jul - LA
23 Jul - LA
24 Jul - LA
25 Jul - Coast Drive
(Drop of rental car in SF and explore the city by public transportation)
26 Jul - Coast Drive
27 Jul - SF
28 Jul - SF
(FLY from SF to NYC)
29 Jul - NYC
30 Jul - NYC, leave

Compared to hermosajoe's iteniary i have added in flights in between Las vegas and LA as i dont want to tire myself by driving so much.

Are those dates the nights where you stay? Also, it would be good to know what day of the week each date is, so:

Fri 08 Jul: NYC
Sat 09 Jul: NYC

and so on ... it makes it clearer in terms of providing you with possible adjustments.

Are those dates the nights where you stay? Also, it would be good to know what day of the week each date is, so:

Fri 08 Jul: NYC
Sat 09 Jul: NYC

and so on ... it makes it clearer in terms of providing you with possible adjustments.

Apologies,

Fri 8 Jul - NYC
Sat 9 Jul - NYC
Sun 10 Jul - NYC
Mon 11 Jul - NYC
(Fly from NYC to SF)
(Pick up rental car in SF)
Tuesday 12 Jul - SF
Wednesday 13 Jul - Yosemite
Thursday 14 Jul - Yosemite
Friday 15 Jul - Lee Vining or Tom's Place
Saturday 16 Jul - Las Vegas via Death Valley
Sunday 17 Jul - Zion
Monday 18 Jul - Zion
Tuesday 19 Jul - Grand Canyon
Wednesday 20 Jul - Grand Canyon
Thursday 21 Jul - Las Vegas
(Fly from Las Vegas to LA)
(Hire new rental car in LA)
Friday 22 Jul - LA
Saturday 23 Jul - LA
Sunday 24 Jul - LA
Monday 25 Jul - Coast Drive
Tueday 26 Jul - Coast Drive (Big Sur)
(Drop off rental car in SF and explore the city by public transportation)
Wednesday 27 Jul - SF
Thursday 28 Jul - SF
(FLY from SF to NYC)
Friday 29 Jul - NYC
Saturday 30 Jul - NYC, leave

(Pick up rental car in SF)
Tuesday 12 Jul - SF

Consider flying into Oakland and leaving as soon as possible for Yosemite. You don't want to be in SF with a car.
That may grant you time to visit Bryce. (A half day here is enough, though a full day is better.)

Thursday 21 Jul - Las Vegas
(Fly from Las Vegas to LA)
(Hire new rental car in LA)

Waste of time and money. Make the drive. It's roughly five hours.

I like your new itinerary.

I like your new itinerary.

Thanks :). I don't see what the big deal is with accommodation booking in Yosemeti. A search in "airbnb" show several private rooms available in surrounding town and if i cant find accomodation i can see the park, sleep somewhere else and then get back to the park next day ,right?

I don't see what the big deal is with accommodation booking in Yosemeti

Park lodging is the issue. Looking "outside the park" may mean you're traveling an hour or two each way to get where you want to go. Roads are slow and often crowded (in other words, don't trust Google Map's times), there are often lines to get into the park, and parking lots become filled. Oh, and on very busy days, they won't even let you in the park. This is why staying within the park is generally more desirable.

But staying outside the park is still better than not going. Just be sure you get an early start.

Btw, "Yosemite."

Agree, keep the car and drive to LA, probably just as fast.
Leave Las Vegas by 8-9 in the morning so you arrive in
LA by early afternoon avoiding the major traffic, hopefully.

Be careful of the lodging " close " to Yosemite, as stated it can be a very long drive just to the entrance.

Don't worry about being alone in a campervan, you'll meet ton's of other travelers, from the US and around the world in the campgrounds, its a very social atmosphere and often turns into a nice party by someone's campfire, anyone with a foreign accent becomes very popular. It's really a excellent way to explore NP's and the scenic west.

Agree, keep the car and drive to LA, probably just as fast.
Leave Las Vegas by 8-9 in the morning so you arrive in
LA by early afternoon avoiding the major traffic, hopefully.

Be careful of the lodging " close " to Yosemite, as stated it can be a very long drive just to the entrance.

Don't worry about being alone in a campervan, you'll meet ton's of other travelers, from the US and around the world in the campgrounds, its a very social atmosphere and often turns into a nice party by someone's campfire, anyone with a foreign accent becomes very popular. It's really a excellent way to explore NP's and the scenic west.

Thanks for your reply. I was just checking the prices for lodging outside the park and it looks very pricey (excess of 100 pounds for a night). Do you recommend certain cheap places to stay inside the park ?

I was wondering whether i could park my car somewhere inside the park or outside and sleep in it?
or if that's nonlegal or unpractical for some reason, whether i could take my tent with me and sleep in that inside the park?

Any ideas / suggestions are greatly appreciated