Celebrity offered a free tour because of delayed embarkation. Our trolley ride was hosted by a very humorous guide who knew her way around. We got to see much of Old Town, went over the Coronado bridge, and saw the beautiful Hotel del Coronado.
The port is beautiful, with the Aloha Tower and nearby shops. No need to take a tour if you'd like to walk around locally. Our tour was fine, a bus ride. The guide didn't seem sure of her information, but was congenial.