If you live in the Bay Area, you don't have to go far to access some of the 1,150 miles of trails at your doorstep in the 65 parks comprising the nation's largest regional parks system. Only a small percentage of the East Bay Regional Park District's 100,000 acres is off-limits to dogs, so when it comes to places to roam with Rover, this patchwork of open space in Alameda and Contra Costa counties is your bag of treats. First time out? Give yourselves a bone by heading to Tilden Regional Park in the Berkeley Hills, where you can soak up the views along an easy, partially paved, three–mile stretch of the East Bay Skyline National Trail; or take your pooch on an enjoyable twelve minute steam train ride through woodland chaparral and views of San Pablo Bay.