There are no simple sentences in this passage, as all of the sentences contain multiple clauses. However, there are compound sentences that can be highlighted in pink:
The slides are scary at first, but we loved the slides after the first ride.
The sprinklers are cool on hot days, and one of the pools makes its own waves, so all the kids try to surf the waves.
The water park can be crowded, but they do not allow pets.
They also sell soda and donuts, and we all love the new water park!