I remember the days when I was in elementary school. I had two best friends on the street where I grew up. One of my friends grew up across the street, with her backyard being the marsh of the East River in Connecticut. I had some marsh in my backyard but it was a small inlet and not as fun! We used to go and ride on it over the marsh grasses! We would take turns, go together, make up adventures. I can still picture myself on it. What is it?