Yes I've been to the Fruggerei and found it to be quite worthwhile. The Augsburg town hall is also worth a visit--there is an entrance fee of a few euros. I enjoyed just walking around the inner city actually. There are many possibilities for a day trip. Munich is the most obvious one as there is so much there. A few weeks ago I was in the Munich area and did a day trip in Ingolstadt which I recommend. There's a lot of history and museums and such in the city. It is also the home to Audi and a museum, though didn't have time to get there. Stuttgart isn't far either, I guess an hour by train from Augsburg. Stuttgart has the Mercedes-Daimler museum while Munich has the BMW museum/works. I've also spent a lot of time in the Starnberg area. It is nice little town next to a lake, so good outdoor activities but has an excellent art museum there too.