One of my favorite seashore spots is Long Beach Island NJ USA. At the northern tip of the island is Barnegat Light. I got there one morning before the sun had a chance to rise. I got a shot of the Barnegat Light that kind of surprised me. I was using a Canon T2i camera which yielded pretty impressive low light results. This pic is also for sale.
Until recently I worked in New Castle DE USA. New Castle has a park on the river called Battery Park. It's on the Delaware River. In the spring and summer they harbor small sailboats in a quiet cove at the river's edge. I've taken some photos there of a few of sailboats. I'll post a few of the shots here below.
The photo below is another picture of the same harbor but on a very sunny day. It is a nice serene and quiet cove.
Farther down the river there is a town called Delaware City. Lots of boats go up and down the river from the Atlantic Ocean and points up river to waterfronts in Wilmington DE and Philadelphia PA. The tug boat below is on it's way up river possibly to Philadelphia.