Get feedback from several people who have been on their quests. Interview more than one quest leader before making a selection. Make sure you are satisfied with all aspects of the quest e.g., location, security, supervision, length of quest. A four-night quest can take up to two weeks if you have to drive out of state, hike to and from your quest site, and drive back. If time is an issue, consider a short quest of one or two days.
Quests held on public land tend to be more secluded.
The downside is that you may be able to see and hear signs of civilization. Yoga studios, meditation institutes and centers for alternative healing can be good resources for quest-leader references. Be sure to interview more than one potential quest leader, as well as people who have been on their quests. You may want to consider a short quest as a steppingstone to a longer one down the road. This could mean a day of fasting and silence, with no computers, TVs or phones.