we went on this ship in March. It's a great ship.I don't remember a juice bar. We had the UDP, we booked our reservations right after boarding around 11:45 am. Went to the chops entrance. we did the northstart, no big deal to book and when I looked a couple of days in, there were times for both during free days(in port).
We loved the music hall on this cruise, the band was great, the kareoke singers were fun, bartenders were really good.
Didn't do the bumper cars, but they looked like fun. the seaplex was in use all the time with a lot of activiry.
We enjoyed wonderland and chops the most. We liked Giovannis, but it didn't feel as special as Chops(we have great Italian in St Louis as well).
UDP works at palymakers, the pub, and giovanni's wine bar.
Dan