Lwaxana Troi comes aboard the ship in the midst of a Betazoid phase that's equivalent to a human woman's menopause, with the Betazoid side effect being the quadrupling (or more) of her sex drive. Lwaxana begins romantically pursuing Picard, which forces him to go into hiding in the holodeck novel world of Dixon Hill in order to avoid her, while avoiding offending her.
"Manhunt" has got to be one of the most padded-out, pointless filler episodes in the entire series' run (with the obvious exception of "Shades of Gray," which we'll get to shortly). It wants to be a comedy with no hard plot — which is fine in concept — but the comedy scenes aren't funny enough and are padded to embarrassing length with meandering material that simply goes nowhere and accomplishes nothing.
It's starts out reasonably, with Lwaxana being her usual attention-starved self — and not even in an off-putting way; she's kind of a likable motormouth. Picard becomes her unwitting one-on-one dinner guest in a situation he didn't expect. His solution is to invite Data to fill the awkward pauses. Not a bad comic concept. But the longer the episode goes on, the more tiresome and pointless it grows, until by the end we're positively baffled: What is the point of all this? The answer is: There isn't one. This is an episode about behavior (I'm at a loss to qualify "behavior" with a useful adjective) put to no purpose.
There are scenes in the holodeck that exist simply to fill time and accomplish nothing the least bit important to anything. They aren't nearly interesting or fun enough to distract from the fact they're pointless. This whole episode is utterly inexplicable.