I can and will do my own homework, of course, but I also want feedback from experienced visitors to Berlin.
My roommate and I will be there for almost 2 weeks in late May and early June. We are both adept at travel, and we are both comfortable with subways, suburban rail, etc. But I'm curious what are the smart alternatives for easy travel in and around Berlin by U and S Bahn. And what are the not-so-smart alternatives? I'm sure there are some that we'd be better off if we avoid.
For example:
Are there multi-day passes that make more sense than buying single day tickets one per day?
Are the "museums included" tickets bargains? Usually, those are not worth it.
Are there partner passes, so both of us together need only one ticket, like Deutsche Bahn has and like I've already bought us?
Etc. All advice welcomed.