Lake Ontario - Rochester Wiki

Lake Ontario Shoreline, near Edgemere DriveLocated just north of the city, Lake Ontario is one of the Great Lakes. We used to have a Fast Ferry which connected us across this body of water to the city of Toronto-but it is gone now. Still—Being so close to the city, it is a major area for recreation.

Irondequoit Bay and Sodus Bay are popular access points, and pleasant destinations for Canoe and Kayaking.
Beaches along the lake are exteremely popular for just about any activity you can think of.
The lake itself offers great fishing and cruising opportunities. Boat Rental is a great way to explore it on your own.
The Port of Rochester in Charlotte offers much to do and many great Restaurants at the Fast Ferry terminal.
The beach in Charlotte and nearby Durand-Eastman Park offer great photo opportunities. Last year ('05) waves along the shore froze, providing an awesome sight.

Lake Ontario (43°30'N, 78°00'W) is the eastern-most and smallest in surface area (7,340 square miles, 18,960 km²) of the Great Lakes, although it exceeds Lake Erie in volume (393 cubic miles, 1639 km³). It is the 14th largest lake in the world and has a shoreline 712 miles (1146 km) long.

Lake Ontario has an elevation of 243 feet (74 m) above sea level. Its length is 193 miles (311 km), and its breadth is 53 miles (85 km). The average depth is 283 feet (86 m), with a maximum depth of 802 feet (244 m). — Wikipedia

Also see: Ontario Beach Park