Perhaps the greatest relaxation technique ever invented. Fishing, esp. fly fishing (read A River Runs Through It if you want to know why bait fishing is evil) is good for your soul. You don't even necessarily have to catch anything to reap the intangible benifits of a day on the river. For me, personally, a day fishing is really conducive to creativity in the evening. Some of my best poems came after a day basking in the sun and the water and the life that is all around you when you are out there on the river.