What Peale said, not all caches are long hikes. Each cache has a rating for difficulty and terrain. Keep yourself within 1 to 1.5 stars for terrain and you should be fine with kids.
Peale, nice. I had a Handspring in 2000 I think. Until it started eating batteries and handspring wouldn't do anything about it. I drop my gps all the time so I don;t think I could use a handspring

I currently have a Garmin eTrex. Simple but works. I use to have a Garmin GPS III+ until the antenna broke. I need to get one with mapping again. My original use for the GPS is to guide myself back home after a motorcycle ride. Maps come in handy for that. Might look into get the GPS V then as I still have my motorcycle mount and power cable from the GPS III.