Last night a group of us decided to hike the Y (a giant "Y" painted on the side of the mountain).
On the way up, we started noticing ring-sized neon green and blue boxes along the way. Curiousity finally got the best of us and we opened them. Each box would have the answer to the previous riddle, as well as a new riddle. Halfway up, we finally met some people who informed us that the boxes were part of a church activity, and the first letter of each answer spelled out the name of a "kidnapper," who turned out to have kidnapped a couple watermelons. It was a fun activity, even though we weren't even part of the group. :)