You have to be a guest at GWL to use the waterpark. Most rooms include 4 passes, with additional passes at a cost of $30 (I believe). There is another water park called the Fallsview Waterpark
(this is located at the Rainbow Bridge, near Casino Niagara) and they allow people to purchase water park passes only without staying in any of the associated hotels neighbouring the park.
GWL has a limited number of wristbands available for visiting friends of resort guests. So you can get into the waterpark without staying in the hotel....you just need to have friends staying at the hotel. We will be there tomorrow, if you are in the neighbourhood, I'm happy to sponsor you in! Sandra