Can family go for the day or how does it work ? Do u have to rent lodging to be able to enter?

Exactly what Tony Mokry said. And always check with GWL abead of time! The policy may differ depending on the GWL location. 😀👍

Requires stay

When they aren't full, they do have guest passes available for entry. These go first to hotel guests that want to bring a friend in. Sometimes they will allow non hotel guests to swim in the day but it depends on availability.

Laly McCauley YOU do have to rent lodging after you enter

Yes you have to rent a lodging for at least one night it's not a come-and-go place like anywhere else