My wife and her sister went on a snorkel expedition on day two and just raved about it (my wife said she would do it again the next day if we didn't have plans). My wife and I also did a trolley tour of the west end area and enjoyed learning more about Bermuda.
Compared to the Bahamas (our other cruise so far), Bermuda is much cleaner and you don't run into people trying to sell you something every five minutes. We only experienced the Heritage Wharf area, including the Clocktower Mall and the Cooperage (Frog and Onion Pub), but would definitely want to visit more of Bermuda in the years ahead. Processing back to the ship was quick and easy.
The only downside was when we tried to leave the ship for the glass bottom boat. We had several members of our party who needed wheelchairs, but there was confusion about whether we could take them off the ship. We got the runaround, and finally we gave up and the two had to walk the short distance to our meeting point with the shore excursion operator. We informed the person booking our cruise with NCL that we needed such help, and was told it would not be a problem.