You'll definitely need a car to get around. If you are really into theme parks, half your week will be already gone.
Night life in Orlando is pretty decent.
If you want more of a chill/hipster vibe check out the bars on Mills50 and Ivanhoe area.
-The Guesthouse
-Will's Pub
-Santiago's Bodega
-The Grape and the Grain
-Ten Ten Brewery
-The Strand
If you want to get shit-faced on the weekend, your best bet is to hit up Wall Street off Orange Ave. You'll be reliving your college days. ( I would suggest you Uber/Lyft if you plan on going hard)
Orlando is central to all the beaches. I prefer the ocean side beaches versus the gulf side. You can travel up and down the A1A and stop by St. Augustine, Marineland, Flagler Beach, and New Symrna to name a few.
Stop by all the donut and coffee shops along the way as well.
St. Pete is about a two hour drive from Orlando and is a good day trip. You can take in the creative scene and rent a kayak and do some water activity or just lay out and work on your tan.
Orlando is also the land of fast food chains, so you can eat to your heart's content without really spending any money.
But if you prefer to drop some $$$ on a good meal, you won't have a problem finding a shortage of them.
Check out the restaurants in Winter Park, which is a neighboring city next to Orlando. 90% of the restaurants on Park Ave are on point.
-Luma
-Prato
-Pannuello's
-Bosphorus
-The Briarpatch
Restaurants that are closer to the theme parks on Sand Lake (Restaurant Row):
-Bar Taco
-Roco's Taco
-Chatham's
-Dragonfly
-Ocean Prime
-too many to name