If you don't mind the boonies and looking for a warm spot for a month you might look at
www.foyspa.com it's where we spend 6-7 months every year. Large sites, lots of hiking near park and also great hiking club. Only 2 1/2 hours from Quartzsite via I10 thru painted canyon and into Coachella valley area. Not sure if you are talking bicycles or quading but both in the area. About 1 hour to Palm Springs,2 Hours to Yuma and Mexico. Lots of activities, 2 great pools 5 hot tubs, disc golf, desert sand golf course, tennis, horseshoes, shuffleboard, exercise room and water exercise classes. And price per month includes tax, and all utilities. We had no intent of loving a park so much but feel in love with the people and friendliness. Let me know if you have any other questions.