I just returned from a RoadScholar trip to Peru/Bolivia trip yesterday. It was a 12 day visit that started at "low" altitude in the sacred valley of Peru (~9,400 ft), made separate day trips to the Inca sites at Ollantaytambo (9,400 ft) and to Machu Picchu (7,970 ft). From there we traveled to Cusco (11,150 ft), on to Puno and Lake Titicaca (12,500 ft). After a day on Lake Titicaca we crossed into Bolivia at Copacabana and then onto Huatajata and La Paz. Lots of side visits to Inca and pre-Inca archaeological sites. My wife and I really enjoyed the visit.
Pros of booking with RoadScholar:
I would not have had a comparable visit on my own. We had a dedicated tour coordinator with us to arrange all travel and make sure everything ran smoothly. He (Juan Carlos) took care of all hotel bookings (no check in, keys waiting on hotel arrival, bags collected from our rooms on travel days and taken to the next hotel room without any intervention by us), booked fantastic restaurants (gave us menus at lunch time and called our choices ahead so food service could be sped up), cancelled a bus-travel day from Puno to Copa Cobana (because of a strike in Peru that blocked the road) and arranged hydrofoil transport down the length of Lake Titicaca to bypass the blockade without any loss of time or any additional cost. He really went above and beyond: one of our party of 16 got altitude sickness at in Bolivia and JC took her to the local clinic, stayed with her to translate, then drove her to a hospital in La Paz for further treatment. I should also add that RoadScholar's automatic insurance took care of all medical bills and offered to supply a companion to fly home with her at no charge. In addition to JC we were also accompanied with a local expert to provide info - Boris in Peru and Marcello in Bolivia. A university prof in Cusco also gave us a couple of short lectures on the Incans; the first on the first day while we acclimatized was great and really supplied a lot of background info which set up the trip. I found the 2nd in Cusco to be less compelling but still ok.
We also were taken into typical Andean homes, exposed to local farmers etc. that were well off the typical tourist track and I feel we got a close-up look at real Andean life.
Cons
The only real con was the lack of flexibility in the itinerary. My wife especially would have enjoyed more free time to explore inside the big cities. We had one afternoon/evening on our own in Cusco (and went to dinner with another couple on the tour) and one morning in La Paz before departure on the last day. One or two full days would have been welcome.
Overall
We will do future RoadScholar trips. The pros far outweighed the cons. I suspect we will always travel on our own to western Europe, but the help provided on this trip to South America was invaluable. There were 16 of us in this group: 4 couples, 2 single guys and 6 single women. I would guess ages ran from late 50's to ~70. Most were fully retired but all were fit and physically capable of handling the walking and climbing. No awkward characters in our group and all got along well and had lots of fun.