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How does my 13th birthday party sound?

My birthday is in the beginning of July and my party is going to take place in my backyard since it is really big. Also it’s going to be a boy/girl party with about 40 people. It’s also going to be kinda like a luau theme/Hawaiian theme.

Food:

Cotton Candy machine (rental)
Popcorn machine (rental)
Snow Cone machine (rental)
chocolate fountain (rental) with fruit and pretzels
Pizza
Cake
Chips

Entertainment:

DJ
HUGE water slide, inflatable (rental)
Cartoon artist
Air brush tattoo artist
Photo booth

Activities:

Limbo
Water balloon fight/toss
Silly string fights (lol)

I need to have more contests besides limbo because I want to give away prizes and stuff and it needs to be stuff I can do outside.
Please help and give any other tips or ideas, and tell me honestly what you think of this party idea. Thanks, xox