Does anyone know whether these are a good deal for cruise ship passengers staying in Bermuda for a few days? Are they only good on public busses? Cost? Any information anyone has on this subject would be greatly appreciated.

Personally, I believe they are a great deal. You can purchase a one day pass ($12) or a 3-day pass ($28) and it is good for all busses and ferries. If you are docked at King's Wharf this is a particularly good deal. I would not plan to visit Bermuda from a cruise ship without purchasing the pass.
Nancy

Thanks. Do you know if the busses go to the beaches, or would I need to take a taxi? Also, do you know where to purchase the bus passes?

Yes, the busses make runs to all of the beaches.
You can purchase passes at the Central Terminal (right next to where the ships dock in Hamilton) of at any of the Visitors Bureaus. Here is a link to their site which shows the routes, bus #'s, cost, etc.

http://www.gov.bm/portal/server.pt?space=CommunityPage&control=SetCommunity&CommunityID=252