We took the 7 day cruise to the Galapagos and the add-on land trip portion to Machu Picchu. The entire trip was amazing!
As far as the cruise to the Galapagos:
-if you like nature: animals, fish, geology, land formations, climatology and watching evolution in action, you can't get much better than this. Every day we saw a wide variety of birds, fish, amphibians as well as insects. The variety was amazing as was the camouflage! We saw turtles, tortoises, land and sea iguanas, fur seals, sea lions,a huge variety of birds including the Blue Boobies, manta rays, penguins, etc, etc. We enjoyed snorkeling and appropriate equipment was provided to us.