From xbox.com:

Help Barbie™ and her friends find the lost horses missing from the local riding school in the first Barbie game for the Xbox video game system.

Join Barbie on an action-packed, 3-D, horse-riding adventure. Ride through five stunning areas, jump over fallen trees, cross rickety bridges, and avoid other potential hazards throughout their quest. Guide Barbie and her horse over thin cliff edges and logs in rivers, leading Barbie to dismount her horse and explore the trails on foot. You can even help Barbie climb ledges and swing hand over hand along low branches.