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Southwest Vacation Sensation. WorldMark Rancho Vistoso, located in Oro Valley 20 miles outside of Tucson, is an excellent base from which to enjoy the best of the Southwest, including lots of on-site amenities, the championship Weiskopf-designed golf course next door, and historic and cultural attractions nearby. Here among the Catalina Mountains the sun shines more than 350 days a year, making your Arizona vacation a memorable treat.