ELKHORN PROVIDES plenty of country for relaxed walks or vigorous hikes and other activities for those who choose not to ride. The tennis court and fifty foot heated swimming pool supply fun and relaxation for kids of all ages, along with shuffleboard, ping pong and horseshoes. Bring your camera and binoculars-the wintering birds of southern Arizona are numerous and colorful, views are magnificent and spring flowers can be glorious. For the less energetic, there are always lazy hours in the sun, the pleasure of burying your nose in a good book and picnics on the desert where you can go by truck out to meet the riders for lunch or for supper beneath the full moon. Nearby sites within an hour or so drive provide the chance to learn about southern Arizona's natural and cultural history - the Arizona-Sonora Desert Museum, Kitt Peak National Observatory, the Buenos Aires National Wildlife Refuge, Tubac and Nogales or the old Spanish missions at San Xavier del Bac and Tumacacori.