Though tattered ragamuffins with gambling hands are prone to dining with the fishes, it's the esteemed members of land-society who dine atop the fishes. Merge seafaring and supping proclivities with today's Groupon for a cruise of Boston Harbor aboard the Spirit of Boston. Choose between the following options:

• For $56, you get a 3-hour dinner cruise Monday through Saturday (up to a $113.84 value).
• For $40, you get a 2-hour Sunday Sunset dinner cruise (a $78.47 value).

The Spirit of Boston treats as many as 600 revelers to fine dining, music, and dancing with the Boston Harbor lights as a backdrop. Step aboard, grab a drink, and tour the ship as she casts off from Commonwealth Pier in the Seaport District. The Sunday Sunset cruise (boarding starts at 5:30 p.m.), running June through September, treats end-of-weekend warriors to a slightly smaller buffet menu than its counterpart but an equally large helping of beautiful views. Shortly after being put to sea on the 3-hour Monday through Saturday dinner cruise (boarding starts at 6:30 p.m.), a smorgasbord will be served at the grand buffet, where cruisers can load up on garlic-encrusted sirloin or herb-marinated pork tenderloin at the carving station. Before sweet teeth reap the rewards of dessert, sink them into a nutritious entree brimming with fresh ingredients, such as the wild Alaskan salmon bedecked in citrus, white wine, dill, and chutney.

While dining or exchanging cannon fire with enemy dinner-cruise ships, guests shouldn't be shocked if they're serenaded with a pop song by a member of the ship's crew—a motley band of sailor-server-singers who often moonlight as boxer-bartender-bankers. Once sea legs grow, take them for a spin on the dance floor, where the ship's disc-jockeyman spins the hottest hornpipes and sea chanteys, or climb to the ship's top deck, a spacious floating patio that offers breathtaking views of the city.

The Spirit of Boston sometimes features a discount online, but this Groupon still offers the best deal available.