Augustiner-Chorherrenstift Herrenchiemsee (Altes Schloss), Herreninsel

It's about €10 to the Island. They only accept cash at the kiosk. (A cash machine is adjacent to the office and pay attention, it will take your cash and card if you're not quick enough to pull out your money, with no alarms or warnings!!!!!..and the emergency holiness is disconnected so you card will be shipped back to your bank eventually), and about €8 when you are at the island if you want to see the castle museum as well. You can walk to it or a short horse and cart ride for €3.50 will also get you there. Unusually, as well as the art gallery, there's a lot of WWII political party history in many rooms which I thought was ugly and misplaced in such a religiously historical building.

There might be some truth to the Augustiner Chorherrenstift museum not being quite as overwhelming as the parlance but that is more or less what is to be expected. It is enjoyable to see the monastery and be in the spiritual presence of the fortress. The staff is a little less welcoming than the palace but not going to ruin your day or anything.