Hey Sweetcamper,
I have the same GPS and bought it because of geocaching, and it works good for me.
Some tips to help you:
The unit can be set for certain icons for found (open treasure chest) and unfound (closed treasure chest) for example. When you send the waypoints to your GPS set them as these icons. Or change if you wish.
Press 'Find' and select 'geocaching', all the caches should appear.
Select the cache you want and here is where the trick comes in.
Selecting 'Go To' and then 'Follow road' will give you driving directions to the cache (if you have that version of mapsource loaded), selecting 'off-road' will simply point to it.
If you select off road, then when you go to the compass page it will have an option of Found, Note and Stop.
Found will automatically change the icon for you to the other one you have selected. I use note to show decrypted hints.
Hope this helps.
Ridilen.