Need help choosing nature spots in Central Europe!

Hi all,

I am currently planning a solo trip to Central Europe for May (I am located in the US). Earlier this week, I posted an itinerary that got some traction, and I made some revisions based on the feedback, shown below.

Prague (3 nights) -> Munich (2 nights) -> ??? + Salzburg? (5 nights) -> Vienna/Bratislava day trip (4 nights)

I am debating where to go for an alpine retreat/sightseeing for 5 nights in the middle of my trip, whether that is in southern Germany or in Tyrol. I am assuming I would need to spend at least a night in Salzburg to get to Vienna the next day.

Based on some of the suggestions from the last post, I was thinking 2 nights in Berchtesgaden, 2 nights in Zell am See, and 1 night in Salzburg, but I am very open to any suggestions.

Also, any info on where to eat, what to do, where to stay, or any other small tips for the other cities is greatly appreciated. I have traveled a bunch before with friends and family, but this is my first time alone. I have already booked all the hostels for the other cities.

For my interests (if pertinent):

I love trying new/unique food

Not big on museums/art

I like to hike/am faster paced at traveling in general

Prefer to use public transportation rather than renting a car

I don't drink at all

Thanks!