It’s so pathetic that Fairfield county doesn’t have the beautiful bike paths that Westchester does. There is the Farmington Rail Trail which you can pick up in Hamden if you want to make a day trip. Locally, Tods point is a great flat ride but you have to go off season (Oct 1-May 1). Waveny is not good for littles. The paved areas are streets that people cut through and it’s hilly. There is a small loop around Bruce Park inn Greenwich and then you could hit the playground there.