I'm about to return to Europe. I found the Lockheed Martin Automated Flight Service very user friendly. It had no problem with recognition, despite my accent. I quickly got to a Briefer ( a very helpful human).
I didn't take an aircraft for more than one day, but could have.
Colorado Flight Centre offer a Mountain Flying Course, which is required if you wish to use airfields above 7000', and also a Back Country Flying Course, going into strips like Mineral Canyon. They also go up to the Idaho strips.
I'm quite happy using hard, long, runways, for scenic flying. I've put some videos on Youtube.
(I eventually overcame my fear of going airside without a yellow jacket)
http://www.youtube.com/watch?v=IwNNrtfAS7I
http://www.youtube.com/watch?v=oZiMy7Dn8iU
http://www.youtube.com/watch?v=1UUQtD9YUpQ
http://www.youtube.com/watch?v=BHBD6TKxMMw
http://www.youtube.com/watch?v=EmmnogqeX1g
http://www.youtube.com/watch?v=frks0jU1kiM