Check out Paradise Pier Garden Grill at DCA. My kids have always liked the lemon chicken skewers, and it is a nice break from the pizza/burgers meals that grow tiresome after a couple of days. The skewers portion is good size so two smaller kids could split one order which includes the yummy chicken, rice pilaf, cucumber salad and warm toasted pita bread. Also it is always easy to find a table with plenty of shade and the lines are short. Bonus points: PPGG has a bandstand with live music performances throughout the day.