I lived in Princeton a few years ago and one of my favorite places for both sushi and chinese was the sunny garden. http://www.sunnygarden.net/index.html. you might also like Theresas pizetta cafe if it's still there and there was a fine french spot across fron the alchemist called L'ahaires? The tap room under the nassau inn used to have live music and a cool scene on the weekends.
You will be fine. Here is one opinion on the matter:
I love Blue Point Grill for very fresh simply prepared seafood. More than that, there is a retail shop next door that prepared amazing boxed lunches. My favorite was a freshly grilled tuna steak sandwich, on top of steak fries.
There are a number of great pizza places in and around princeton. My favorites are:
DeLorenzo's in Trenton
Cranbury Pizza in Cranbury
Conte's Pizza in Princeton
Old World in Princeton
People make a lot of jokes about food in Princeton. The fact is that there are a lot of very good places, and a nice variety, especially for a pretty small town. Plus, there are lot of cities close by that have good places. Finally, you are one hour from Manhattan.