We took the 1 week Galapagos trip on the Islander (48 psgr capacity) as a family of 4. This is a relatively new tour for Nat Geo/Lindblad, 2 days shorter than their standard trip to accommodate people with limited vacation schedules, and we chose it primarily because it worked for the younger generation in our group (Millennials with limited vacation time). We came in with high expectations, due to the Nat Geo name, but had only mixed results.
The itinerary included San Cristobal, Espanola, and Floreana, the Eastern portion of the archipelago. We were in a Main level cabin, which seemed to get much less movement than those two floors up. Loved being able to go straight from panga to room hot shower after snorkeling.
The Galapagos are indeed amazing, and our overall memories of the experience are fond.