What to do for my child to third birthday party?

Okay so my son is turning three years young on 24 July. I'm hosting a party at my house and I'm going to get a water slide for children, but what I get for adults? water tank is a good idea? or want the westle sumo, but it will be the heat? or is there something more for adults to play? and what children should play games, something my son can play too? The theme will be SpongeBob and im going to be doing Krabby patties, and what else should I do?

To be very frank, I do not remember what happened at parties my birthday until I was 8 years. And all I remember my eighth birthday party was had cake fell into my shoes and some friends came over. N need to go all out for a third birthday party until the age of five possible. That's when most children begin to learn and memorize things better.

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