Pools along Esplanade provide an excellent place for a rest/nap/picnic.
Aim for a day with an easterly breeze (or anything but westerly). I listed this paddle as moderate only because heading back upstream with a westerly wind is certainly a good workout. Decent chop within the lower Charles River Basin adds to the workout.
From the North/South/East: take Storrow Drive westbound until it becomes Soldiers Field Road. Artesani Park is a right turn off of Soldiers Field Road westbound.