Yes Peru. But, not with the SMB, rather with Overseas Adventure Travel.
http://www.oattravel.com/Find-Trips.asp ... dAdventure
Going in my biggest worry was the food. I'm a picky eater, and the food was great! Plenty of locally grown foods to eat, and great tastes. Did you know Peru is the birthplace of the potato? The have over 1000 varieties of potato! And large kernel corn. And Quinoa. And more. I did gain weight!
This trip requires some hiking - never more than a couple of miles - and some exposure to high altitudes. The post trip extension to Lake Titicaca was over 13,000'.
All in all a great experience. If anyone is thinking about a trip like this, I would highly reccomend this trip. It is a small tour group ~16 people max. So, smaller buses and smaller groups can go places the big groups cannot. The local guides are friendly, knowledgeable and make everything go smoothly, even the airport and luggage was handled quickly and professionally.
Someday, we will have some pictures posted to an photosharing website and then I will post a link so you can look at them.
Feel free to ask questions.
No affilitation other than I used this company for the trip.