... or at least Steve McGarrett, Danny Williams, and Duke took a cruise.
The start of the episode has two men escorting a third to various banks where he withdraws cash from his client's account and takes bonds from their safety deposit boxes.
A bank manager gets suspicious .... he's been tipped to the unusual activity by other bank managers, and when the two men in the bank, Keene Curtis as the "victim" and another man holding a gun on him flee, bank guards pursue. One is shot, the gunman is shot, and a US Congressman who gets involved is shot and dies in the OR.
Keene Curtis is found beside the road, and the driver boards a cruise ship leaving in a half hour. So the three 5-0 men stay on the ship, where they have five days to find the robber/murderer.
The episode probably has a couple of plot holes and one very obvious scene, but it's good drama and a good watch.