The roads on Arnold Arboretum are for service vehicles only. The grounds are beautiful examples of nature tamed by man. The result is a bike ride rated by many as one of the best rides in the Boston area. Paved and car free makes for a relaxing ride to melt away your stress. The arboretum consists of 281 acres on the campus of Harvard University. Architect for the arboretum was Frederick Law Olmsted, known for designing Central Park in NYC.
Parking is on street but free. There is no admission fee and you can cycle on any paved road or path. It should be mentioned it is not flat. Peters Hill gives you an amazing view of the city. The main loop is only 4.5 miles but there are many additional paved paths and spurs. Be sure to bring a camera.
For more information visit their web site: Arnold Arboretum.