My Blackberry 8330 with Geocache Navigator is on the money as far as finding GZ as well as my PN-40. I would be a little concerned with a 5 year old running around with a Blackberry. Thats were a good GPSr would be the saving grace in your case.
Welcome to Geocaching and happy hunting!!
Seems like fun with a few other cachers along for the ride. A day out to spend with friends. Not something I would enjoy day after day of it.
By the way, how out one set up a Pocket Query of just the ones on this power run?
I use the DeLorme Cache Register program with my PN-40 and go paperless. It also loads pocket queries from geocaching.com. The real nice part is it loads your Field Notes from the PN-40 right to geocaching.com Field Notes page.
I vote for the DeLorme Cache Register!