One way to get outdoors and enjoy all that autumn offers is to take the King County Conservation Futures GeoTour starting Oct. 6.

The GPS-driven treasure hunt will take place at 20 King County Parks cache sites and is designed to raise awareness about the 111,000 acres of land the Conservation Futures program has protected from development during the last 30 years.

The Conservation Futures GeoTour Kickoff is 9 a.m. on Saturday at Anti-Aircraft Peak Trailhead in Cougar Mountain Regional Wildland Park. The first 190 people to fill out their GeoTour Passport with 20 unique stamps found in the cache boxes earn a commemorative geocoin.

The first use of Conservation Futures in 1982 protected 2,000 acres of farmland. The first parkland purchased was 1,400 acres on Cougar Mountain after public outcry about a planned housing development. Now at 3,100 acres, the regional park is the crown jewel of the 26,000 acre King County Parks system.

During the 30 years King County has partnered with cities, nonprofit groups, volunteers and civic leaders to protect 99,000 acres of Cascade foothills, 3,200 acres of urban greenbelts and parks, four miles of Puget Sound shoreline and 4,700 acres of habitat along rivers and creeks.