If you're outdoorsy, you enjoy spending a lot of time outside. Outdoorsy people like to hike, climb mountains, ski, and do other sporty activities that can't be done indoors.
Use the informal adjective outdoorsy to describe people who always seem to be out in the fresh air, especially if they're healthy, active, and a little bit windblown. Your outdoorsy friend might prefer hiking in the woods or swimming in the ocean to watching a movie with a big bowl of popcorn on her lap. You might even call her an outdoorswoman — that would also capture her fondness for the outdoors.