Are you seeing speedo at waterparks?

[Torchwatch]

There is nothing indecent or inappropriate in your choice of swimwear. Unless federal or local law, or water park policy prohibit them there is no reason why you can't wear them and why staff or members of the public should be able to complain about you.
Go to the water parks when you want to, don't feel limited to school term times, children used to swim in speedos and it did them no harm. They don't need protection from men in speedos. You may have concerns that children or their parents may be abusive towards you, but once you have paid for entry you have the right to use the facilities without unreasonable abuse.
Your ticket to the water park gives you unlimited use of the facilities until it time expires, the session ends or the water park closes for the night. So long as you stay within the terms and conditions of your ticket water park staff and members of the public have no authority over you. Leaving before staff begin to notice you is an unreasonable restriction on the terms and conditions of your ticket. leave when you want to within these terms and conditions.
In Nazi Germany Jews were made to wear a star of David and gay men to wear a pink triangle, they were then portrayed as monsters, arrested and murdered. Today being Jewish, gay or simply being a single man wearing speedos does not make you a monster and a threat to children.
If you feel grumpy at a water park be grumpy, stop smiling!