On a previous visit to Peru we visited Cusco, Machu Pichu, Puno, and Lake Titicaca and loved it. However we (mainly me) had quite bad problems with altitude for the first few days, although after about 4 days things improved. We are planning to spend some time in Ecuador in April, finishing with 2 days around Quito (2,800m).
We are then looking for a few days easy trekking in Peru at low altitude, no more that 3,000m, before going on to Titicaca and La Paz (3,800m). I have spent some time looking for low elevation treks but most seem to go well over 4,000m. I know the Andes are high, but then so are the Alps and the Himalayas, where there is some great low level trekking, so I feel it must also be possible in Peru.
Any suggestions would be greatly appreciated.