Live for at least a week homeless, in a foreign country with no money for food or water. Preferably on the beach, it makes for great sunsets, and the pigeons nibble on your toes in the morning.
Honestly it gives you the best time to think about your life, and things you need to change. Also it gives you a great opportunity to meet new people. Some of whom you maybe dont want to meet again, but it is life altering.