for using Geocaching in school projects...
a few suggestions to get you started...
Teach your classmates about Geocaching! Explain what it is (see 'what is
geocaching' in the links below)
show them a GPS and give them the coordinates for your classroom.
If your GPS shows a map or tracks your movements, you can save the coordinates
for each stop that your bus makes on the way to school and show your classmates
the track log. Ask your parents or teacher to help you hide a cache
on the school property for your classmates to find. You may even get your
teacher and classmates excited enough about geocaching to create travel bugs
to place in caches and watch their journey on-line!
Check the internet for more ideas. Here is an interesting site that tells
about an elementary grade class and their geocaching adventures: http://seth.dynip.com/giftedland/units/geocaching/