Learn how to use a Global Positioning System (GPS) to participate in the world's biggest "treasure hunt," geocaching. Use coordinates and clues to find hidden caches left by other geocachers all around the world.

Fee: $8.00 per adult 13 years of age and older, $3.00 for Texas State Park Pass holders, and $1.00 for children between the ages of 5 and 12.

Reservations are required; to reserve your spot must call the office at (915) 444-9121.

Bring water, snacks, sturdy shoes, weather-appropriate clothing, and sun protection.