You will love the Galapagoes - they were simply unbelievable. Be sure to snorkle there if you can. The sea lions came and swam with us. But bring sea sickness meds. I recommend something sold as 'Bonine' here. It was brilliant with no sleepiness.

And Macchu Piccu is incredible too. You will want to take the bus up the mountain from Aquas Calientes, but you can walk down the steps back into town and explore the flowers and birds. Cusco was the Inca capital, so it has some fabulous architecture - much better construction than Macchu Piccu which has been largely reconstructed.

Have a great trip and I am in the SF area as well, if you want to email me...