I've quite often got free time during the week after taking the kids to school and before picking them again if I'm not working.
So I've come up with an occasional challenge, which shall be henceforth called the "School Run". The idea is to drop the kids at school at 8:50 and run somewhere, before returning to pick them up at 15:20.
6 1/2 hours should be good for a good few hilly miles. I've done it before on the bike, and it can be quite challenging getting back "just in time".
My first School Run is plotted for tomorrow at 25 miles. From here over to the Woodbine Cafe for lunch and then back again. Weather is looking bang on.