Baths were a lot more fun when I was little and could take my Teenage Mutant Ninja Turtles action figures in with me!  As an adult, it's more appropriate to just take a book into the bath with you; but what if it gets wet?  Don't worry, there's a way around that.

This trick jumped out to me because you probably already have everything you need for this, especially if you have a dog.  Check it out!