Two-hour city bus tours with English-speaking guides are available from the Frankfurt Tourist Office throughout the year.
Ebbelwei Express. The one-hour Apple Wine Express tour in a vintage streetcar is offered hourly weekends and some holidays. It gives you a quick look at the city's neighborhoods, a bit of Frankfurt history, and a chance to sample Apfelwein (a bottle, along with pretzels, is included in the fare). 069/2132–2425; www.ebbelwei-express.com. From €8.
Frankfurt Personenschiffahrt Primus-Linie. Day trips on the Main River and Rhine excursions run from April through October and leave from the Frankfurt Mainkai am Eiserner Steg, just south of the Römer complex. The boats are available for private parties, too. Mainkai 36, Altstadt, Frankfurt, Hesse, 60311. 069/133–8370; www.primus-linie.de. From €8.95.