Fun "experience" gift for a 2 year old?

My best friend’s baby is turning two in a couple weeks, and my husband and I want to give him (and subsequently his parents) an experience gift. Like we would take him to the zoo or whatever. His has a million brightly colored plastic toys, and we want to give them a gift as well as they just had a new baby. He goes to the zoo all the time, so we want something a bit different. We live in Seattle, if that helps.