You will not need a car in SF. Use WAYMO! It's cheap and fun, and there is no driver! I use them all the time.there are a ton of great places to eat not too far from Moscone (reasonable walk) ... a few of my casual favorites
Tadisch seafood grille (California st near Battery st)
Perbacco (italian - california st)
La Mar Cocina (peruvian seafood = next to the ferry terminal)
noshing at the Ferry Terminal - Gotts is a favorite
chinatown - great chinese (i don't know names)
i will think of a few others, but i know some of the locals will have a few thoughts.
I highly recommend La Mar Cocina. Fabulous seafood. Water Bar is a good steakhouse over near the base of the bridge on the Embarcadero, and The Progress over on Fillmore is always great.
Fisherman's Wharf (Scoma's, Cioppino's , etc) is always fun, but very touristy and the food is generally touristy too.
Still touristy, but classic for breakfast is Buena Vista (near Girhardelli square in the Wharf area) get the Eggs Benedict and some Irish coffee..