The Brecon Beacons and Black Mountains hold plenty of opportunity for adventure.
There are lots of adventure centres to choose from, try Black Mountains Activities, Absolute Adventure, Adventure Britain, Treads and Trails, Llangorse Multi Activity Centre, www.interactivities-uk.com
If you have a head for heights you could try gliding, try South East Wales Hang gliding & Paragliding club or The Black mountain gliding club