For their final National Park, the South Downs, Dave and Tobias had a go at geocaching - a cross between treasure hunting and orienteering. It turned out to be a lot of fun.
Supported by Mini
Ask any married man and they'll tell you that all harebrained schemes must be approved by the long haired general - a system of checks and balances that ensure you don't do anything totally stupid.
How I got away with this one I don't know. To attempt to visit all 15 National Parks of Great Britain in 15 days is a tough feat. However, to squeeze in 15 micro adventure challenges in the process - well, that's just illy.