At the ruins of Tulúm in Quintana Roo, Mexico:

You can’t actually walk on this beach (it’s reserved for nesting sea turtles), but a trail through the site runs right past it — and it makes a great foreground for shots like this! The only real problem is that trash tends to wash up after storms, so you need to clone it out of your shot (since, obviously, you can’t walk out and get it off the beach).