I second Colin's comment, there's a lot of moving parts to this kind of solution (power, antennas, height, client access areas, etc).
I can see though, for that kind of deployment, you will want to use what we call a 'linear mesh' solution. This involves using our MSR 2000/4000 and MST200 series APs. If you read through our Outdoor Networks VRD (at the link below starting at page 70 and 120), you can build a high-speed, full throughput linear mesh using the MSR2000/4000/MST-200 APs along the course or lifts. Those APs, and using directional 5GHz antnenas with mid-gain omni antennas for client access should accomplish what you need.
http://www.arubanetworks.com/technology/reference-design-guides/#Outdoor_Mesh
I have worked with a 14-node 34-node linear-mesh deployment for a customer that carries IP video over the network and uses solar panels for power, and is able to sustain over 40Mbps good put over 3.5 miles of dense, curvy wooded roads. A downhill ski course, or following the lift routes, should be an easy solution, but requires some substational planning for your power purposes.