I switch hobbies every 4 or 5 years. Thank god I have a wife who understands me. Each and everytime I invest/waste a small fortune, only to move onto my next obsession. Some of the hobbies I've done over the years are:
Fine Scale Aircraft Models,
Paddleball (Brooklyn, NY),
Tennis,
Skiing,
Guitar,
Archery,
Bow Hunting,
Competitive Pistol Shooting,
Scale Model Trains,
Photography,
Warhammer 40K,
Grilling,
Woodworking,
Tournament Bass Fishing,
Boat restoration.