Chiemsee is such an underrated day-trip. We came to know about this place from a friend in a casual conversation and we googled (if that’s a verb) for further information.
It is just a 1 hour journey from Munich and it’s a good idea to set off early.
Once you reach Chiemsee, you can choose from one of the packages for conveyance to the various islands – Herreninsel and Fraueninsel.
Herreninsel has this beautiful  palace built by Ludwig II called Herrenchiemsee while the Fraueninsel has a nunnery and shops which sell Cloister liquor and Marzipan.
The place is very scenic and the travels to and from the islands are a good experience too. It is a great trip to make in the summers but is fun and open in the winters too but with reduced opening times.
If you get a long weekend and see that the weather is good, you’re not going to repent taking this trip.