With the extremes of the XC and the Snow Centre in Hemel Hempstead to Go Ape in Wendover Woods, just outside Tring, the Borough of Dacorum could be classed as the adrenaline and adventure capital of Hertfordshire.
And for something even more unusual, visit the Centre of Horseback Combat to find out more about horseback archery, jousting and stunt riding!
For more traditional active and outdoor activities, there are plenty of walking and cycling routes in the countryside between the three towns of Hemel Hempstead, Berkhamsted and Tring. The Chiltern Electric Bike Tour offers guided bike rides through the Chilterns, or hire a bike from Dacorum Cycle Hub.
Tring Reservoirs provide a peaceful haven for birdwatchers and anglers.