hi cornelia
your itinerary does make sense, but i'm not sure if you have "included" the driving time in your itinerary ?
for the first part of your itinerary as an example and with some other comments:
- day one arrive in windhoek and overnight there. depending on the time of your arrival, pick-up your 4x4 on day one or on day two, and do some shopping
- windhoek is a nice enough capital city, but with nothing in my opinion that you really have to see, so i fell that one night there is enough
- day two - its about a 5 hours drive to sesriem. if you pick up your vehicle on day 2, and assuming that you want to have time enroute to stop, enjoy the beautiful views, have lunch etc. most of day 2 will be gone by the time you get to sesriem
- in sesriem, you want to stay close to the entrance gate (that opens after sunrise), so that you can enter the park when the gate opens. the further away you stay from the gate, the earlier you have to get up to get there by sunrise. if you have a 4x4 with a roof-tent, you can camp in one of the 2 camps grounds (sesriem campsite is right next to the gate and the newer sossus oasis campsite is just 5km away from it). if you dont want to camp, places you might want to look at are sossusvlei lodge (also a good place to have lunch if you are camping) and desert camp.
- as mentionned, you want to enter the park when the gate opens. its about 60km to sossuvlei, and the light is amazing in the early morning.
- by staying two nights as sesriem (which is your plan), this gives you a full day there, which is good. if you want to splurge, you could consider going on a early morning hot-air balloon flight over the namib naukluft park on the second morning.
- travelling from sesriem to swakopmund is also a very nice and scenic journey, with plenty of places to stop and enjoy the view, see the strange welwitschia plant, have a piece of apple pie at the shop/restaurant/gas station in solitaire. so that will probably take most of the day.
- and therefore i would stay for 2 nights in swakopmund (as per your original plan), so that you have one full day there. if you can stay only one night, thats also okay, but than it will be just a gateway.
- it totally depends on your interests, but i would probably stay for 2 nights in damaraland
- etosha is (apart from sossusvlei) my "must see place" in namibia, and i would definitely stay there for 3 nights or even better, 4 nights. with 4 nights and if your budgets allows some splurging, you could stay for 2 nights at okaukuejo restcamp and then spoil yourself to two nights at dolomite camp, which is in the western part of the park that was not acessible for many years (and i believe it is now acessible only for visitors who stay at dolomite)