Hesse

There are large regional networks of public transport:

Nordhessischer VerkehrsVerbund NVV

Rhein-Main-Verkehrsverbund RMV

"Hessenticket" for day-long on Local trains in Hesse and Mainz for up to 5 people.

German National Railways offer the "Schönes-Wochenende-Ticket" for day-long unlimited travel on local trains nationwide on week ends.