If you are in a shallow depth of water, see if he is able to lay down resting his forearms on the bottom. Face away from his face and ride him that way. Again, the buoyancy of the water makes doing the squats much easier.

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If the water is shallow, lay on your back. Put one leg up, and have him enter in closely. One of his hands will hold your leg up, the other can be used on your clitoris.

If you are able to rest your head on the edge of the pool, or hot tub, have him bring each of your legs around his waist, so he can do you that way.

Grab onto a raft and have him come in from behind you. He can move your legs up or down to create a different sensation for both of you.

Have him sit on an inner tube and sit on him while he is on it. Lean back and he can thrust that way. You can also place your legs on his shoulders.