I live in Maidenhead and have been skating for the last year mainly in London. I even skated now and again at Lee Valley while I worked in New Spitalfields Market. I was amazed to find Eton rowing lake right on my doorstep with two adjacent 5 km smooth, fast running, tranquil (lots of birdlife like Serpentine), tarmac laid cycle path and single track road WOW. They are even digging a second lake right next door. I turned up parked and skated, spoke to a couple of dog walkers and a coach for the rowers, he just said avoid the inner path when the coach is on his bike with a megaphone, no problem!
So I recommend it check out http://www.dorneylake.com
perfect for a quiet day away from the crowds at a quick pace.
See you there?!