Water park 33 weeks 4 days

The local water park in my state allows fathers in for free on Father's Day. We are so excited to go and I know I won't be able to ride all the rides like I used to. That doesn't bother me but what does is my feet. They usually don't swell very much but I know they will eventually today. What would you mommies suggest to keep the swelling down. Btw, my son is 3 years old and a total momma's boy, so I already know he will only want me to swim with him and we all know kids have A LOT of energy