Healthy snacks and meals to eat?

I'm trying to loose some weight and tone up before the Summer (preferrably by the first or second week of June), but I don't know what to get to eat! I'm supposed to eat healthy and snack, but I have issues with buying the right things! I like stuff such as Goldfish crackers, cherries, watermelon and stuff like that. Also, meals... and I don't eat seafood.