Hatun Machay 

The Andean kingdom ( www.andeankingdom.com ) is the travel agency that manages this climbing areas including the refugee.
Some of the rutes can be seen on this blog:
toposperu.wordpress.com/huaraz/hatun-machay/

Toposperu is now on:
www.toposperu.com

Hatun Machay sits at the 131km mark south of Huaraz. Around a 1.5-2hr drive is what to expect on the way to this gem of a sport climbing area. Camping exists just outside the refuge for those not willing to shell out the 25 soles to stay in the refugio. Bring all your food as there is non in the refugio. A stream 50ft behind the cabin provides good drinking water, but don't forget either your filter/steripen/tablets as there are a fair amount of cows wandering the area. There is a 5sole entrance fee to the area which is sometimes added to the cost of your transportation (if using andean kingdom), but this is not always the case so be sure to double check.

With an elevation around 4200meters Hatun Machay provides a refreshing sport climbing experience for the avid low elevation climber. Those who have not taken the time to acclimate need not worry to much though as most of the routes sport gymlike bolting and juges galore. Most of the grades tend to be in the 5.10-11 range with a few exceptions in either direction, but as with any climbing area you are sure to find inaccuracies in the ratings. The refugio offers the use of their topo's for free so be sure to snag one as soon as you get off the bus. Andean Kingdom (across from caca de guias in Huaraz) offers gear rental for sport climbing as well as mountaineering. A full sport climbing package including 2 harnesses, 2 belay devices w/ lockers, 15 qd's, 1 60m rope, a daisy chain w/ lockers, and shoes will run you 60 soles (about $23). Transportation to HM is split between everyone taking the bus there that day, which during high season is usually packed.

Bring your bolt kit and wire brush if you want to stay for a week or more because there are TONS of routes still to be climbed.

Amazing place to go and climb, hike or just soak in the landscape. I went there towards the middle of June and the weather was perfect. Peru basically has two seasons: wet and dry. The dry season coincides with the North American summer so pretty perfect to head down there for a few weeks (or months if you can) and climb away.
As any new place goes, some of the routes are still chossy and need to be cleaned and run up-and-down a few times to get rid of the poor holds. While I was down there, over 5-6 people were specifically at Hatun Machay to put up more routes so if you can, bring a kit and start bolting.
The cost of a flight down to Lima from the East Coast of the United States was about 400 USD one way. From there, you can take several different types of buses to Huaraz, a mecca of climbing and mountaineering, for about 30 USD. And from Huaraz to Hatun Machay via buses and taxis is about another 20 USD.
Also for a bit of trivia, Hatuan Machay means "rock forest". Enjoy the climb!

This place is a must-visit if you are in the "neighborhood".

I cut my sport climbing teeth in this area and it was a life changing place to say the least. Everyone in the refugio tends to be really cool and very easy to find a partner or group if you're on your own. If you haven't been an elevation, or even if you have, you will notice the toll the lack of oxygen takes while you're panting up a well pocketed 30 m route, but it's such a great temperature and unbelievable scenery that your heavy breathing doesn't seem as painful. Most of the routes set by Andres are closely bolted and made my newbie bolting skills grow in confidence without feeling too scared off by run outs. Definitely some scary overhangs/chimneys/landings if you don't have an attentive belayer, but all are good fun. The rock quality can best be described as SHARP. My skin was destroyed after climbing the better part of 2.5 weeks here not counting rest days. Having said that, that was also with a couple heavy bouldering days, but, don't forget that tape. Gets cold at night, so don't skimp on your insulation. VERY sunny here, so even though the temperature is great, bring sunscreen and a hat.

Climbing gear is super expensive in Peru so Andean Kingdom much like many guide services or guides, will often offer to buy your gear off you if you're so inclined. If you bought something on a great sale or just want to be a good climbing semaritan and bring some new sale stuff to sell, everyone will love you for it. Chalk, shoes, and draws seem to be the most sought after items not counting mountaineering gear, they're always after that.

Just want to make an amendment to the description of Hatun above. Definitely volcanic tuff, not granite. From what I understand, Hatun used to be an ocean bed which has since been raised to elevation due to the the tectonic plates subverting under the South American coast. Hence, the Andes.

But thats somewhat irrelevant. The point is, the rock is sharp as hell, there is a lifetime of bouldering and sport potential (sorry traddies, not much for you here), its still extremely undeveloped, and bring good beer or wine for the refuge keepers. Its a tough life we live.