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Dublin Hills Regional Park is on the west side of Dublin, close to Shaefer ranch development. Trails at Dublin Hills Regional Park generally are in grassland regions, with scattered oak forests in the canyons. The main trail follows Calaveras Ridge for 2½ miles. A network of short trails (the Donlon Loop Trail) leads to a housing development along Dublin Boulevard. Hikers are not allowed to park in this housing development. A loop can be made with this network of short trails, although this route is too narrow for cyclists and equestrians. A further Martin Canyon Creek Trail, which connects to both the Donlon Loop Trail and the Calaveras Ridge Trail, goes in the direction of the Martin Canyon Creek Trail open space. Other minor trails come to dead-ends at the edges of the park.
Dublin Hills Regional Park covers 654 acres (2,650,000 m2) in Alameda County, California, United States, west of the city of Dublin. It is part of the East Bay Regional Park District (EBRPD). The park is accessible from the Donlon Hill Staging Area, which is on Dublin Boulevard near Dublin, California.
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The annual Saint Patrick's Day celebration includes a 5K Fun Run and Walk, a pancake breakfast, a two-day festival, and a parade. The parade is popular with residents and visitors from outside Dublin alike and has been growing in popularity each year. It is sponsored by the Dublin Host Lions Club and features bands and colorful floats. The Dublin firefighters sponsor the pancake breakfast, and tours of the firehouse are popular with children. The festival continues all weekend and features food, games, kiddie rides, arts & crafts, and information about local organizations. The festival is held at the Civic Center on Dublin Blvd.