Activities with a one-year-old

Lizardboy’s first birthday is going to take place the day after my brother’s wedding, which is out of state (Wisconsin), and my sister is planning on having a mini-birthday party for him while we’re up there, but is planning on making it a “non-gift” party–if we want to give him something, she’s asked that it be some sort of activity/date “coupon” (such as a trip to the zoo, etc.). What would be a fun and interesting place to take a one-year-old?

Just a note: I’ve been planning on posting this thread all week, but I kept forgetting. I’m off to my brother’s wedding shower this weekend and I might not get a chance to check back before I get back home, so if you post a brilliant suggestion, I’m not ignoring you! :wink: