What is the fine-grained topic of the following text: The valley rests between two ridges that contain the Terra Linda-Sleepy Hollow Divide Northern Preserve to the north east) and the Loma Alta Open Space Preserve to the south west—both providing hiking and horseback riding opportunities. Only return the topic.
Hiking and horseback riding opportunities in Terra Linda-Sleepy Hollow Divide Northern Preserve and Loma Alta Open Space Preserve.