If you are weary of hearing students in your math classroom lament, "I'll never use this stuff in the real world," try using geocaching for a math lesson. Bring angles to life by hiding or finding the coordinates of a cache at the top of a small, sloping hill, or use one to determine the area of a large park.
Select a location. Break the classroom down into several groups and give them each a list of items they need to find along the way. These can vary depending upon your environment, but could include types of rocks, plants or pictures of birds taken with digital or disposable cameras. The first group to complete their list wins, and the whole class will benefit by working as teams and experiencing nature firsthand.
Your classroom can be on the hiding instead of the seeking end of the activity, as well. Create several geocaches and include items the classroom can track together, such as "Geocoins" or "Travel Bugs," which can be tracked online. Determine which geocache travels furthest.
Plant several small caches along a route, and give the classroom the coordinates of only the first one, which will contain a math problem and note cards with two or three possible solutions. Each solution will have new coordinates, but only the correct solution will lead to the next stash.