As you walk the winding path through the park entrance, at one point you should find yourself with the changing rooms in front of you, gift shop to the right and the wave pool to the left. Proceed straight past the changing rooms / lockers and follow the signs for "Out of the Way Cay." Crushin' Gusher is out that way.
Looking at an older map of the park, it would be in the lower right-hand corner of the park. .