I like Richard Long.
(he was at art college in bristol btw. legend had it he was chucked off the course for being too out there, literally)
I guess you know Hamish fulton too, kind of similar but fewer physical traces, more the walk being the art?
I do like andy goldsworthy but richard long and hamish fulton seem a bit more purist, more fine art, less down to earth sculpture.
(i know lots of people will hate them. But that's art for you isn't it).