Hi,
I went with my dd when she was 16 months old. Mind you I was also 7 months prego with ds!!! My dd loved it!! They can go on alot of rides with you on your lap. She is much more animated now at 3 and it is definelty more fun now, but we thought it was great then! Bring a coloring book and a few markers, and one or two board books with you everywhere. When my dd would get ansy on a bus or boat I would read her a book or sing old mac donald to her to keep her attention. I think because we introduced her to the characters and everything so young she really loves it now and we just keep going back. Stuff a few lollipops in your bag too and goldfish.
Good luck, have a great time!