Bashar NuseibehThere are a number of Boston trolley operators. I've tried the Old Town Trolley Tours a couple of times and they're great. Trolleys make over 15 stops (one outside the Sheraton Hotel), but can stay on board for 100 minutes to get a fully narrated tour of the city. Alternately, you can hop off, exlpore an area on foot, then hop back again and continue the tour. It's a good value for your money.