We have done the
ABD Peru and the Costa Rica trip. We loved them both. The Peru trip was the more difficult for some due to the elevation, but we had no problems at all with that.
The current version of the Galapagos/
Amazon trip looks amazing. If we didn't already have things booked and in the hopper, we would jump on this. You can't go wrong on any of the three. If you go Galapagos, please do an updated trip report as there are not many for this trip. Go while you can!