Start by eating at Moe's or Five Guys (my favorite) - a family of 4 can make it out of either for under $25. A word of caution if you're watching the beltline - the Jr. Burgers are actually regular single burgers, the Burgers are huge doubles. And don't miss out on the delicious peanut-oil fried, French fries. Top it off with some ice cream at Cold Stone Creamery - Tuesday nights are buy one, get one free. :)
Then walk down to Cranes Roost Park for the Choreographed Dancing Fountain Show, playing nightly (except Tuesdays) at 8PM & 9PM. Stroll around the lake or just over the boardwalk and back and enjoy some fresh air.