Ask them to close their eyes and wade them around gently in the water. Better/cheaper than a flotation tank and a good way to foster relaxation and intimacy. Try it if you haven’t. It’s one of the best sensations in the world.
We got In trouble and then we got out of it and then we got in bigger trouble… and the whole time we were dressed like clowns! Eventually made it to the out of season Halloween party though!