Adult Intense Treasure Hunt Clues

One good way of running a car treasure hunt is to provide a cryptic clue to a street name, and then ask a question like "What sort of tree is growing in front of number *?", or "What is distinctive about the letterbox of number *?"

The cryptic clue should not be too difficult; the aim is to cause a bit of fun and possibly a little delay -- not to completely bamboozle the participants and make the course almost impossible.