Agree, Neuschwanstein is less than 10 minutes drive from Fuessen, but nearly a 1:30 drive from Garmisch. We stayed twice, 5 nights total, in Fuessen at the Hotel zum Hechten.
www.hotel-hechten.com
If your reading RS book and are inclined to stay or visit Reutte, skip it. We visited twice and don't get his recommendation at all. After leaving Fuessen, the Zugspitze is easy and relatively quick to visit. This is in Ehrwald, Austria.
www.zugspitze.at
Then continue on and go via the Fern Pass to the Innsbruck area and across the Europa Bridge and the Brenner Pass into Italy and the Dolomites.
Reifenstein castle/castel Tasso, just outside Sterzing/Vipiteno in Italy, and highly recommended by RS, may be worth visitng. We tried twice, but you MUST have 4 people, otherwise the woman that lives there will not give the tour. We were there twice with 3 people hoping to find a fourth there. Even pleading that I'd pay for the 4th person (that wasn't there) and showing her that my wife had walked up to the entrance (steep walk) with a broken foot did nothing. She said no four people, no tour. We wouldn't back, but it did look very interesting and very authentic, even the grounds.
Once you near Innsbruck the scenery is outstanding. Heading into Italy also. Once you get off the A22 and head towards the Val Gardena and get your first close glimpses of the Dolomite peaks...
You'll never forget that moment. Well I haven't :)
By the way, RS barely scratches the surface of the Dolomites. His recommendation of basing in Castelrotto must be because he never ventured anywhere else in the region. Castelrotto isn't even in the Dolomites, but on the outskirts.
Paul