Hello Greg! Welcome back to the Disney Parks Moms Panel.
Whenever my little ones start to outgrow certain activities at Walt Disney World Resort, I look ahead to the times when I might be able to bring my grandchildren to relive all of the Endlessly Magical "first times".
As far as a visit to one of the Walt Disney World Resort Water Parks, a quick check of the
Restricted Personal Items list does not appear to include any of the items you listed as bringing to
Disney's Typhoon Lagoon Water Park.
The only item that may be a concern is the inner tubes as there are already inner tubes within Disney's Typhoon Lagoon Water Park and I believe that you must use one of the provided tubes when lounging in the
Castaway Creek Lazy River or the
Typhoon Lagoon Surf Pool.
I understand that smaller children do not fit well in the Theme Park-sized inner tubes and that they would prefer their own. You could always bring them and use one of the
lockers on site for storage if you are informed that you may not use them.
Be sure to try
Miss Adventure Falls while at Disney's Typhoon Lagoon Water Park; I've heard it's amazing and have yet to try it personally!
Have a Splash-tacular Adventure!
~Todd