OK. Amberg is halfway between Grafenwhor and Hohenfels, so most of the guys who've been in Germany on a tour know where it is. It's a nice little town with a decent church. You're close to Bamberg if you want to chase college girls. You're about an hour from Nuremberg (West) and an hour from Regensburg (South).
Nuremberg, which had a huge rep for building armor in Gothic times, does not have a really good knife shop. Here's a mural of the smith at work:
Still, there are good displays at the Bavarian History Museum if you're into that stuff. You can also find a good amount of old military tuff, but be very careful with WWII stuff. Most is fake and anything with a swatsika on it will get you in trouble (it's illegal). Still, the castle is one of the best to look at for the quality of the forifications, and sometimes you can find a deal in the market square. Nuremberg does have a Frankonia Jagd (hunting) store. They have knives. They are expensive. See Google for location.
Regensburg has two good knife shops. I bought several knives there. Use Google for locations. They are only open until 5 pm M-F, and 10-2 on Sat. (normal for most stores). I like Regensburg, and it's an easy city to get around in. If you go, park outside the city center (by the river) and walk in.
One thing you should do, is buy any knife magazines you can find. Look at the Train Stations (Bahnhof), they have the best news stands. You can look thru them and see if there are any places near you in the ads.
Also, use your GoogleFu and see if there are any custom makers in the area you're visiting. Make sure you write them ahead of time to let them know you will visit, as many do this only part time.
Wods you'll want to know: (say them the way I spell them)
Messer = knife
zoo ver cow finn = to buy/to sell
vee toy'r = how much?
da dru been = over there
It's pretty easy to get around Germany; everybody speaks English and there's an Information booth in any city. Going into the old "East" is harder.