I too am a generalist. I first started in southern hemisphere temperate forests recreationally and as a wildlife ranger - this is my first love. I spent an awful lot of time in semi-arid areas, desert, and tropical rainforest/jungle in Australia into Papua New Guinea and Malaysia in the army. Plus a few other places around the world.
I've spent a lot of time recreational hiking in California - mountains and along the coast.
I love mountains - being above the treeline is great. I climb, but not much. Currently in the Pyrenees. Unfortunately the ski season is over and my beloved snow is gone. But the spring flowers are coming out.
I guess dense-ish forest is my first love. Open desert and grasslands are just a job. Mountains are great - close second place to forest.
Reggie