to the hudson river, which carries ships through new york and just like mark twain, you can cruise the mississippi and ohio rivers. ♪ but the smaller ships sail for a more intimate experience and there are also a lot of themed journeys, so you want to find the one that's right for you. >> river cruises carry around 150 passengers, so you avoid the crowds on the megaships. a river cruise costs more than an ocean cruise, but the price often includes your drinks and shore excursions. >> different than a normal ocean cruise. >> nice. so, for more on river cruising, go to cnn.com/travel. would you pay $150,000 bucks to sing happy birthday? the song that you traditionally sing for free? how about with a price tag now?