Going to a park with water rides ? My suggestion, Get some better quality (don't buy the cheapo brands) Zip lock sandwich bags. When you go into the park, put it inside one and zip it up and put it in your pocket.
I've learned this the hard way over the years (trashed a phone or 2 due to water damage), When I go anywhere near water (beach, amusement parks, etc), I always put my phone in a zip lock bag.
1. Takes a second or 2 to get out, and you should be able to hear and press buttons through the bag if needed.
2. Gives good protection on water, would not jump in the pool but, should survive getting a little wet even direct splashes with wet pants for a while.
I normally do this to my phone and wallet, I have fallen off a boat into the ocean( a little drunk that day) with this setup, My phone survived with out getting a drop wet(same with my wallet), I was with just the phone, in salt water, the phone with not be recoverable at all.
Trust me, it's cheap and it works great, again don't get the really no name cheapo bags, you will pay for it as they rip easy...
No warranty with this post, YMMV, it worked for me and has worked good over the years but, it's not 100%...but, a heck of a lot better than just a naked phone