Save in Paris on Seine River cruises. It's not a trip to Paris if you don't take a Bateau Mouche, an open-air sightseeing boat up and down the meandering Seine. The boats move slowly enough to take in breathtaking views—Notre Dame, the Louvre, and the Eiffel Tower.
Vedettes du Pont Neuf is the best company for bargain-hunters. There are no obligatory meals or drinks on board. Bring your own instead, stopping at a grocery store in advance. (And know that, this being Paris, alcoholic beverages are permitted on board). Since there are twenty departures a day between 10:30 am and 10:30 pm, you can swing by whenever it's convenient. Best of all for penny-pinchers (or should I say "eurocent-pinchers"?), you can get a four-euro discount off the 11-euro price by buying your ticket in advance online at the Vedettes du Pont Neuf website.
—Laurie Pike, a blogger in Paris, is writing for our Affordable Europe series.