We spent a great half-day white-water rafting on the river not far from the hotel. There are a couple of companies that run these tours and I believe they're all based in Cusco and come for the day. I'd recommend booking online or in Cusco (they'll pick up at the Tambo) or else you'll pay quadruple the price if you book through the Tambo's service.

Also, if you don't want to pay the $80 US the Tambo charges for a ride to the airport, walk 5 minutes to the bus station (left out of the gates, follow the main road) and hire a taxi there for about $30. There are a couple of quality restaurants in town as well, so don't be afraid to wander.

There are a few other sites nearby that can be seen in a loop: Salinas (salt works), Moray, and Maras. Again, hire a local taxi.