iac: If going for parnassa there might be a heter that doesn’t exist when going for pleasure. And even then it depends on the extent of the situation. Is she dressed in swimwear or how a typical goyta dresses in the street?
In either event, even if there’s a heter if it is possible to switch seats that is surely necessary.
Regarding cruises, multiple participants have confirmed that even on the so-called “kosher” cruises one must bear witness to those roaming around in swimwear or close to that.