I would buy the Colorado Rockies! Hire a gm who can put a championship team together. Sadly it would be too late to get Todd Helton a championship. I'd say buy the broncos too, but honestly Pat Bowlen is doing a terrific job.
Build cabin in woods, set all my friends for life.
Build a mech, or hire a team to build a mech. Not sure if I would go with a battletech mech, or go all out and build a jaegar.
Learn more computer skills, or just pay someone who already has them, and make "improvements" to my favorite games.
Continue my workout regiment, except turn my home into the best gym around. Learn martial arts from around the world i.e. Muay Thai from Thailand, jiu-jitzu from Brazil, judo from Japan, maybe study under the great sensei Neil Ohlenkamp himself, become good enough myself to teach others
Practice my martial arts, and master weaponry, both ancient and modern. work a few hours everyday on archery, marksmanship, take up Kendo, fencing.
Oh and of course play my games, tabletop RPG's with friends, movies, etc
Volunteer with Fire Department, Search and Rescue, EMS, or some combo.