The Galapagos was a dream trip for us, however it wasn't really a trip that was feasible to do without a guide. We researched boats and decided to book the Cachlote. We spent 8 days in the Galapagos and saw many amazing animals with a very knowledgable guide.
Galapagos Boat Options (This spreadsheet may be out of date now that many of the itineraries have changed.)