You can't spend time in Old Forge and not attend the water park! Make a day out of it, stay at one of the local hotels or cabins available for rent. This way you can walk to and from the park.
The water park has all the rides you can imagine to keep you busy all day long. Plus they will keep you cool during the hot, humid air in the summer.
Prices vary year to year and season passes are available.
Pack a lunch and drinks to bring with you as it is expensive to eat inside the park. And remember that this park is fun for all ages.