Climbing is simple walk up. You need two days to get there on foot. From the "basecamp" there is 3 hours to the top, 1 down. You need walking poles and gaiters. Cramp-ones are useful but no necessary.
Mismi has several peeks, they form the ridge. We climbed only eastern one. We were told in Arequipa, that it is the highest one. But recently I have found information, that the middle one is the highest.
Some agencies from Arequipa offer climbing Mismi (and visiting the souce of Amazon River) but I guess not many people do it. In Chivay I have seen photos from the annual competition in fast climbing Mismi, but I don't know more about it.
From plaza you go by the school (west) and up in the direction of hill with the cross. Ask locals and keep to the left of valley if any problems. You go by the deserted village (of a name Ran-Ran) and keep to the path. Way goes up to something looking like pass and through the plateau. Finely you reach a valley with herds of lamas and alpacas (at least we met them). You can camp there. The next day keep walking up the stream (called Mismi). In the middle of a day you spot a pass - walk towards it. At the end the way is a little bit steeper. Your "basecamp" will be close to the pass. It takes one day to return from the "basecamp" to Tuti.
Tuti: 3600 m, deserted village (Ran-Ran): 4060 m, water (look at the map below): 4620 m, C1: 4540 m, C2: 4950 m, C3: 5180 m, Amazon's source: 5171 m, the pass: 5290 m.
On the way there are no huts for tourists. There is a shepherd’s stone hut near our camp 1, another one on the way, but nothing close to the "basecamp". Bring the tent with you.
We made three camps but you can do only two.
Water in Mismi stream is brownie - partially from the plants and peat, partially from the lama's and alpaca's excrement. The shepherd told us that it is safe, but we purified the water.
Behind the lake there is stone wall. Come back to the pass and walk left but down. We found water that is the beginning of the Carhuasanta stream and Amazon River.
TUTI , -15.530720, -71.547850
WATER , -15.515140, -71.594670
DES VILLAG , -15.524790, -71.565900
CAMP 1 , -15.510490, -71.614670
CAMP 2 , -15.502010, -71.664940
CAMP 3 , -15.501370, -71.674830
PASS , -15.500370, -71.680340
NEV MISMI , -15.517030, -71.678400
AMAZON SOU , -15.508840, -71.695870