Pleasant hike, and I'm not kidding; I can't say enough great things about the Dunes camp grounds, other then it's the best camping in 100 miles easily. I grew up camping here my whole life and never once had a problem with rangers or groundsmen. They let my parents get away with some pretty rowdy shenanigans as long as your polite and respectful to them and the nature around you. They even don't mind (or haven't for me) allowing sleeping in overflow parking for the night for free. Very nice people there and much love for that place.
This is one of my favorite hikes to go on when I just need to get away from it all. They've built up the road a bit in the last couple years to get to it, but they've also blocked the second parking lot. Get there early on a weekend to ensure you don't have to park on the side of the road. I do this one at least once a year in November. It gets a bit nippy but the views are georgous. The last time I did this one was in April 2012. The tall ships were in town so it was really croweded when I left. There is another trail to the right to the "hole in the head" This one has a ver steep incline and I've only done it once. The views aren't as great.
If you are looking to get away with a short hike this is a good one to do. Don't forget to stop by the Tides and get some clam choward to enjoy on Doran Beach before you head back!