Reply to Party ideas or places to have a birthday party for two boys?

Chuck e cheese can get pretty expensive, and even local kids indoor play area. They all cost around $300-$400. I'm doing my daughter bday on 7/27 at our local splash pads. We are having bbq. Foods include, hamburger, chicken wings, chow mein, vegtable skewers (mushroom, bell pepper, and zuchinni), and watermelon, chips and drinks. For birthday cake, it might melt in the heat, so I'm just making homemade cupcakes. I think splash pad is more fun, that way the kids get to play in splash pads, while mom hang out, and the dads chill together. Low cost budget birthday!