Also for the kids there is enough to enjoy.

Horse riding, castles to visit, canoe or kayaking, hot-air ballooning, visit caves, a zoöligisch park and of course the chateau of Josephine Baker.

Some websites:
www.canoe-kayak-dordogne.com
www.canoes-loisirs.com (canoeing along the castles)
www.parczooreynou.com
www.gouffre-de-padirac.com
www.gouffre-de-la-fage.com
www.grottes-de-lacave.com (impressive caves)
Chateau de Fenelon
Caves of  Lascaux (The famous cave in France)
www.jardins-imaginaire.com
Chateau-Hautefort
www.milandes.com (Chateau of Josephine Baker)
www.aquariumperigordnoir.com
www.perigord-dordogne-montgolfieres.com
www.parc-aux-dinosaures.com
www.laforetacheval-brignac.fr (horse riding) 
www.unimedoc.com (for dad)