Yes! Adults need to have fun too! Any slide for adults in a house is a great idea, but this one contains a water slide. Excellent choice of transportation and you can even get a shower on the way out of bed going down to get breakfast!
This "natural" outdoor hot tub would go great with my Japanese garden theme. It is almost like a hot spring. I'd get rid of the ugly fence in the background though and have a lot of flowers, trees, and bushes.