Franklin Montessori in Darnstown. the whole campus is surrounded by playgrounds. there are three really large playgrounds for 3-5, and three (may be) for younger kids. they go out two to three times a day for an extended day program, 30 mins/session. they also get to walk around the woods, feed the birds every now and then.
Its been a while since my kids went there but we loved the focus on nature and the outdoors. Its a huge part of the experience. They only stay inside when the weather is dangerous -thunder/lightening, blizzard etc. When my older child started public school she was jealous that they had indoor recess all the time while her younger sibling got to play outside everyday.