These trails in California were awesome, easy to navigate, the rocks good surface... Got to visit California again.
are you asking about favorite spot for hiking, favorite spot for hiking specifically barefoot, or just favorite spot in general? i really don't know if i could choose an answer for any of those. especially if it's regarding hiking, the main thrill comes from the exploration and discovery of a new place. so generally, my favorite hiking spot is wherever i'm going next. but to give a sort of answer, white top mountain in virginia has some of the best views i've personally witnessed.
Love to go a roving, the countryside has beauty everywhere - one only has to look to see it, I also enjoy barefoot walking; with the grass is a softer tread, but can be a bit rough when scaling rock and harsher tracks
My favorite is the arboretum near my house. Nice dirt trails. Also sand, grass and my favorite, pine needles. I don't even mind the gravel service road.
My favourite walk is a section of the Kirklees way. It goes through varying terrain and I love feeling the different textures under my bare soles. I start out on an asphalt surface, then a field which usually is full of nettles, followed by a trip through a woods which is always muddy, hop over a sty and into a field l, which leads to an old road where the asphalt has broken up, this then goes to a big cow field with lots of cow pats, from this I walk over a main road and down a dirt track. I go down the track a few hundred yards turn around and walk back.
I do like hiking in Sandstone or Granite mountain areas, as the trails there are usually wonderful to go (way more comfortable than limestone, for example) and usually offer a wide range of sensual and visual experience. For example we have great such trails in the Vosges mountain range or in the Alps. As it's not so far away from my home, i often go weekend hiking in the middle / northern Vosges or the Palatinate Forest, which are also the site of a trans-border biosphere reserve. If you care to stay clear from the main touristic spots or the villages, you can also take a chance to hike "barefoot up to the head" if you feel like.
Can we say "Dunes?" What's not to like about sand...especially if water runs through it. Colorado Dunes National Park, and Oregon Dunes National Recreation Area. Both excellent areas.
Favorite hike was Bell Rock trail in Sedona, AZ. Much of the trail was fine red dirt, almost like red baby powder. My feet were red afterwards. There was a dry river bed with nice smooth rocks that felt nice. Would like to do that trail after a good rain - creamy red mud would be fun.