The route through the 10 caches is intended to be family friendly with mostly easy walking along a well surfaced towpath, though a couple of caches are a few metres off the main path. Hopefully it'll give you a good morning / afternoon stroll on a nice day. The route is alongside the canal though, with a few locks on the way, so be careful with little ones. You can either start in Woking (plenty of parking and easy train access) and do them in order, or park at St John's Lye in St John's village and go in reverse order. There are usually a lot of muggles around on the towpath, so you'll need to be discreet.
This one is a green camouflage bullet cache. No pen in this one: you'll need to bring your own.