Ein verlängertes Wochenende am Bodensee

Fortune smiles my way again: I'll be spending a long weekend in Konstanz, Saturday 4/26 - Tuesday 4/29. I'm not sure which breweries I'll be able to visit, although I would like to see Rolf at Flözlingen again. Maybe I can squeeze in the other two breweries in Ehingen, and maybe Gasthaus Brauerei Sonne in Herrenzimmern, if I can figure out when they're open.