Are you tired of the packed-in feel of small dog parks, and the same forced questions from well-meaning fellow dog lovers: Is it a boy or a girl? What's his name? How old is she? If so, then escape to the Westminster Dog Park, 420 acres of off-leash open space where you and your best friend can wander the empty landscape. In the summer, gather around a pond, throw sticks and balls and let your dog cool off in the water; in the winter, ski, snowshoe and sled alongside Fido. You'll both be worn out afterward.