Out to Sea (1997)

Care-free Charlie (Walter Matthau) cons his widower brother-in-law Herb (Jack Lemmon) into an expenses-paid luxury cruise in search of rich, lonely ladies. The catch is that they are required to be dance hosts! With a tyrannical cruise director, and the luscious Liz and lovely Vivian, our heroes have lots of mis-adventures before they finally return to port.