I recently returned from the private Tapiche O’Hara Reserve, a reliable site for Red-faced Uakari. This site is reached in less that a day’s river travel from Iquitos Peru, and it appears to be straightforward to made daily observations of the Uakari.
While there are other accessible Peruvian lodges with the Uakari, sighings are generally rare (maybe a sighting every few weeks, even at research stations with active primatologists).
Tapiche O’Hara is, to my knowledge, the only Peruvian site with reliable daily Uakari sightings that is accessible in less than a day’s travel from a commercial airport (Iquitos).
This is one of the most intact easily accessible mammal faunas in Loreto (I work as an ornithologist all around this region).
Details at http://www.greentrack-jungle.com/