Chattahoochee River Park is a great little park not far outside the city that is very family friendly, and great for flatwater paddling. This area is very picturesque and serene once you paddle away from the boat ramp. This is where the Atlanta Rowing Club meets. There is a playground and walking trails here too, making it a great place for a family outing. Rentals can be attained at the nearby Go With The Flow in Historic Downtown Roswell.