I'm going to be in northern Germany for two days in early March. I'm arriving via Flixbus in Schwerin, visiting Schwerin on the first day, and traveling to Ludwigslust, (possibly back to Schwerin), and on to Rostock on the second day. I'm trying to figure out the best way to get around between Schwerin, Ludwigslust, and Rostock, and one of the things I stumbled upon is the DB Regional Day Ticket. The various DB tickets are really confusing me, but this one appears to allow for unlimited travel within one region on one day for 23 Euro.
Has anyone had experience with the Regional Day Ticket? And is this something I should be purchasing in advance online, or could pick up in Schwerin the morning of my travel?