Hello! I will be flying into Munich and staying in the city center for a couple of days before then traveling down to Regensburg to take a river cruise. Because I'll be traveling to Regensburg on a Sunday and it looks like the only train from the main Munich train station to Regensburg on Sundays leaves around 5am, I'm thinking about going back to the airport and taking a train from the Munich airport to Regensburg.
From what I've read, the S-Bahn is the best way to travel between the Munich airport and the city center. From the airport, I'll then take RE22 to Regensburg.
Is there a train pass I could buy to cover all of these trips? Or will I need to purchase separate tickets for the S-Bahn and regional train?
I'll have all my travel luggage if that also makes a difference.