In the country info you´l find advice about touristy towns, scenic rides etc. Also: it does not have to be exact on the direct railline, as you can use any connection too.

Most famous town is Salzburg-from the Sound of Music movie (ask your parents-or perhaps grandma). Immensely populair with chinese now.

I myself have some liking for lakes+mountains and there are a few-biggest is between Villach and Klagenfurt in Carinthia.

Note that just the single ride M-Salzbr can be done for much less on a Bayerticket as a passday for 2! But if you connect from further in M then it may be different

Thanks so much that’s really helpful, yes had thought of Salzburg - as I’m new on here where do you find the country information? Do you mean on the main website? Will also take a look at Carinthia as we too like lakes and mountains. Thanks also for tip about tickets. 

several stop overs are possible i would suggest Graz (Austria) or Slovenia (Lake Bled, LAke Bohinj, Postoinja Caves Park)