Bath time is always fun for my kids.
There was a time when all four of my children could fit (just barely) into a large tub. That time has passed, but they still love bath time. Typically now my girls have a bath each evening and my boys have a shower, although a couple times a week one of the boys will hop into the tub when the girls are done or my older daughter will prefer a shower. The kids in the bath slide around, splash, play with containers, make bubbles and generally have a grand old time.
Bath time is fun time.