Be careful with kids folks, put silly challenges in front of them and they might just say " when can we go do that ? "
Long story ... but it's how I got back into cycling.
Our kids (never having ridden their MTBs more than 2 miles from home) suddenly had the "opportunity" to ride John o' Groats - Land's End.
Ended up being out "family holiday" in 2010.... youngest to go the whole way on his own bike was only 12 at the time.