Thousand Trails Campgrounds are offering unlimited access to many of its camping preserves through an annual Zone Park Pass launched in honor of Thousand Trails’ 40th anniversary.

Starting at $499, annual pass holders can access between 18 and 81 properties a year, depending on which specific zone or zones they choose.

“We listened to our customers and potential customers,” said Joe McAdams, president of Equity LifeStyle Properties Inc., the parent company of Thousand Trails. “They have told us they want to stay with us, they want to experience the freedom to visit multiple Thousand Trails locations and to use the wide array of amenities we offer. Many RVers and campers want the increased flexibility that comes with an annual pass type program.”

Each Zone Park Pass covers a zone, or region, of Thousand Trails’ campgrounds in the United States: Northeast, Southeast, Northwest and Southwest/California.

Traditional memberships to Thousand Trails with expanded usage rights and benefits are also still offered.

More information about the new zone program is available at the Thousand Trails’ website, www.ThousandTrails.com.