I recommend sitting down and listing ten things you might do for fun, just because you enjoy them. Then look at that list and circle the ones that don't have a fixed start time (like zoos, fairs, festivals, museums, outdoor walks, amusement parks, beaches, etc. etc. etc.) If you haven't circled anything, repeat the exercise with another ten things you like to do. If the area where you live publishes a directory of local events, that's a useful place to start.