Charles River Reservation Full Bike Loop is a 27.7 mile moderately trafficked loop trail located near Cambridge, MA that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is accessible from March until October. Dogs are also able to use this trail.
Follow this guide along the Charles River Bike Path all the way out to the Blue Heron Bike Path in Waltham and back. Follow this guide to complete a huge loop of the Charles River all the way to Waltham and back to the Cambridgeside Galleria. I've created a lot of POI's for the most interesting areas of the main Charles River Bike Path but have drawn an accurate track all the way out to Waltham and back if you would like to go that far. You will make a loop around the Mt. Feake Cemetery and head back on the opposite side of the river for different views. Beyond this the Charles River piddles out into a swampy area then a small river so it's not worth going further.