What to expect:
Hare: Bucket in my mouth
Hashcash: 5€
Location: Parkplatz an der Zitadelle
https://maps.app.goo.gl/vDnriCPXVvRgCvVU8
49.99305819620304, 8.27364975976685
Take S8 or a RE to Mainz Römisches Theater. When you have arrived, get on the side of the tracks where the ruins of the roman amphitheater are. To the left should be a set of stairs. Ascend. When you have reached the top, turn right onto Zitadellenweg leading up to the Zitadelle. Enter through the main gate and keep going straight towards the Zitadellencafé.