Went perfectly. We had about 7 hours in the Magic Kingdom, which was plenty of time for us to do all the rides that we wanted. The ride there and back was very smooth and well-organized.
We had a combined kayaking/snorkeling tour, and it was really nice. First we had about a 1/2 hour boat ride to a fairly secluded cove, and then had about 1 and 1/2 hours for the kayaking/snorkeling. The kayaking in the open water was a little more strenuous then we'd expected, but it was fun. The snorkeling was great, and we saw lots of tropical fish. It was the first time I'd done either activity.
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