Something is recreational if you do it just for fun. If you're not a professional golfer but love the game, it's recreational.
Anything you do because you enjoy it — rather than because you are obligated to do it — is recreational. Hiking, reading, and visiting museums can all be described this way. Recreational means "something done for recreation," and recreation, which was originally "the curing of a sick person," combines the Latin re, "again" and creare, "to create." Today we think of recreational activities as curing our boredom.