If you are in San Diego without a car, this is an awesome way to get around and see all the main sites. We only had one day, but if you had two days it would be well worth it. We stayed and got on in the Gaslamp and got off to see the Old Town Historic Park and the USS Midway museum and this filled one day. Also got off briefly on Coronado to take an emergency family phone call but did not do much there. Be aware the Hotel Coronado and property have a huge renovation going on now. All the guides on the various trolleys were knowledgeable and pleasant. Trolleys run every 30 minutes now, and on a Saturday we were always able to get on the next bus, but they usually did fill.