Lac Rossi sits on the north side of Parc national du Mont-Tremblant in the Laurentian mountains of Quebec, near La Macaza. The lake is accessible from a parking area and boat launch off Route 18, approximately 25 minutes from the southern entrance to the park's La Diable Sector. A dam is located to the left of the launch, audible but not visible from the put-in. From the launch, paddlers pass through a river-like narrow neck of water before reaching the main body of the lake, with rocks marking the entrance to the open water. A beaver lodge is present on the lake. The estimated round-trip paddling distance around the lake is over 5 miles.

Only non-motorized watercraft are permitted on Lac Rossi, keeping the lake free of motorboat traffic. Twenty-three paddle-in campsites are distributed in small clusters around the lake, situated on sandy shores. Sites range from 1 to 5 kilometers from the parking area and launch. The operating season runs from May through October. Reservations are required and must be made in advance by phone at 1-800-665-6527; online booking is not available for this location.

Discovery packages are available from May through September for first-time canoe campers, bundling canoe equipment rental, firewood, and a camping permit. No water is available at the campsites. The La Diable canoe camping map, available for purchase at the park, covers Lac Rossi and the surrounding area. A free digital bathymetric and fishing map of the lake is also available through Sépaq via the Avenza Maps app.

The lake shares the north side of the park with Lac de la Savane, and both are described as destinations for paddlers seeking calm water and a wilderness experience. The park as a whole supports 40 species of mammals, and loons are noted as part of the soundscape at the lake. The sandy shoreline campsites contribute to a backcountry atmosphere that is relatively accessible given the short paddle distances involved.