Hi
@Kenny3
Happy New Year.
I'm sure I remember at 3 months that I was back to work and
some play, but there were still residual aches and pains.
I looked it up on my recovery thread. Click here to read my 3 month update.
The waterpark.

Lots of stairs, slippery ones at that...I know I could still have "out of the blue" weakness and I was wary of ladders and slippery surfaces for the first year until I felt I had regained all my strength and balance.
Honestly (and I have been known to be a devil-may-care
adventurous sort

), this is a situation I would have had to take a pass on.
Children's actions at a waterpark can be unpredictable...my daughter lifeguarded at one for years and despite rules...they can slide down before bottom of slide is cleared and so on....
Just my opinion- but the more time you give that hip to heal and soft tissue to strengthen, the less risk for an incident that may wreck that new hip.
You WILL get there...and I have been to our local waterpark and on slides...but it was well over a year post-op!