The cache..

After entering the waypoint of the cache, you basically just follow the arrow direction that's shown on the GPS unit. It'll show you how far you are and how long it'll take to get there. The GPS unit took me right to the spot (i had to cycle uphill for 10 gruelling minutes!) where it was hidden under some rocks in a park. After finding it, you log in your find in the log book in the box and can help yourself to a momento from the box. Of course, you have to leave something in return, hence the S$2 note.