Searching on websites will not help you find those gems which are not 'popular' or 'usual'. The very fact that they are on the www makes them popular. If you are 'up for anything' may I suggest that you leave both your route and your daily destinations flexible, and follow those signs you see, and which look interesting to you. You never know what you will find. But be equipped with good maps of the area - do not rely on digital mapping alone.
And of course, talk to the locals. I cannot begin to list the out-of-the-way places I have been, which were suggested to me by a ranger or local resident.