I would suggest using smartphones or pocket pcs for this one! Other machines could crash due to sound effects.
I suggest keeping the sound on for audio clues, and also to get strange looks off passing muggles. 
Slow down as you reach the zones to give the GPS time to catch up.
Tweezers and pen required.
The final physical cache is overlooked by muggle dwellings so a little stealth will be required.
Check location desriptions before anything else or you may miss important information.
Please make sure to check your inventory etc before leaving each zone. Once a zone is left it closes.
It took me 25 mins to get to the final location and 10 mins to get back to the start. There are 2 ways to do this cache. With or without stairs. People with buggies, Wheelchairs, mobility scooters or simply in ill health, will be able to complete the cartridge just as well.
There are some busy roads on the tour, so please be careful with Geokids.
The Cartridge
Download the cartridge here: Click Here
iPhone users can download the wherigo player from the appstore (Search for 'Wherigo').
Android users can download whereyougo from Google Play.
The cache
This Wherigo adventure leads you to a final physical cache. (A small camo bag the size of a matchbox) You need to sign the logbook in this, in order to claim a find.