The estate has some of the best arctic-alpine flora in Britain and although restricted by the acidic granite geology, is important for plants including alpine speedwell (Veronica alpina). Habitats of European importance include Caledonian forest, wet and dry heaths, and montane acid grassland. The Caledonian pinewoods have characteristic species such as twinflower (Linnaea borealis).

Significant mammal species include red squirrel, otter and water vole, and notable breeding birds include golden eagle, peregrine falcon, dotterel and snow bunting.

The architectural importance of the estate is reflected in that there are 5 listed buildings including Mar Lodge which was built in 1895 by the Duke of Fife. This has recently been converted into holiday flats and retains many of the grand features of its heyday as a hunting lodge. The ballroom has a spectacular 2,435 red deer stags heads lining the walls and ceiling!

The estate is managed to conserve its landscape, archaeology, buildings, wildlife, and to provide public benefit through access and conservation. Current work includes reducing red deer numbers in order to promote the natural regeneration of native Caledonian pine woodland and improving the existing forestry plantations for wildlife by removing fences and non-native trees. Fences are a major hazard for capercaillie and black grouse and cause a significant number of deaths through birds flying into fences.

With 15 Munros the estate is popular for walking and climbing in summer and ski touring and ice climbing in winter. The National Trust for Scotland has adopted the 'The Long Walk In' principle and has a policy of open public access on foot.

The estate continues its long sporting tradition with red and roe deer stalking and red grouse shooting.

A Ranger Service has been established to inform and assist the visitors to the estate.