www.fltplan.com is a good place to setup your flight plan and
http://aviationweather.gov/ for images and future weather outlook. I did quite a bit of offshore flying at one time in a single and even had the engine start to quit once. Luckily I was only 15 miles out and able to pretty much glide back barely making it to an airport. It's a pucker factor that's for sure. The only reason I was out there was because a helicopter went missing. Anyway unless it's for gas, or even then, and engine doesn't just quit on those things. You'll get sputtering or rough running with sounds before they go out. If you do fly a single make sure you do your run-ups and comply with over water regs.