Before the Galapagos, we spent a few days in Quito where we walked around the old town, visited a few museums, and also visited the Mitad del Mundo (equator) as well as the "real" equator exhibit a few hundred feet from the official equator. I don't think visiting either is worth the bus ride out there. When we returned to Quito from the Galapagos, we had 4 days left in Quito during which we did some high altitude hiking up Rucu Pinchincha (4698m / 15,413ft), Guagua Pinchincha (4794m / 15,728 ft), and finally Cotopaxi (5897 m / 19,347 ft).