I did the Galapagos portion - the exact trip with the same itinerary on the same boat with Abercrombie and Kent. It was amazing. Words can not describe teh natural beauty and fearlessness of the creatures that inhabitit these amazing islands.
We loved it but a few bits of advice. Quito is VERY, VERY high altitude. DS - who was 5 at the time - got very bad altitude sickness, both arriving in Quito and going back to Quito on return trip. We were limited in what we could do there because of it. I got food poisoning on the return portion of the trip - you need to be very careful what you eat and drink, even in an American style hotel. (I have travelled all over the world and this is the first time I have ever had it!)
There is a lot of difficult hiking. The trails are primarily volcanic rock which is either sharp and/or slippery. You need to get to the islands by jumping off a panga and hopping back on to a panga (rubber raft). This is fun - but not super easy if you are not mobile.
It is an amazing trip and I would love to do it again with Disney. We also loved the people - very friendly and proud of their country.