How to describe a person who loves everything about nature and the outdoors

I'm looking for a good adjective to describe a person who loves experiencing nature, as in a person who has been in the Boy Scouts for most of his life, loves fishing, hiking, mountain climbing, sleeping under an open sky, ice fishing, canoeing, crosscountry skiing and other things along those lines. A true-born “nature freak.”

I'd call that person an outdoorsman

There are a lot of adjectives which describe the physical activeness of somebody:

brisk, alacritous, yary, jaunty, evelié, exilient, sprack

And to modify these words, you can use adjectives which relate to natural wilderness, such as:

bucolic, fielden, agrest, rural, predial