Together, they solve beach-related crimes, every week. Loitering-related murder came up a lot. Eh, we've heard worse ideas for shows...
So, What Happened?
It got "X-Filed."
Baywatch Nights didn't turn into the mega-hit its predecessor was, and producer/star David Hasselhoff wanted a piece of all the money X-Files was making at the time. So, he started forcing a science-fiction plot into every single episode. You would think that they would run out of sci-fi beach crime plots quickly, and... they did.
And thus some of the most ridiculous plots ever aired on TV were born. Episodes included:
A mutant mermaid serial killer;
David Hasselhoff getting cloned to save himself from mutated Brazillian-body-snatching snails.
That transition from "shitty" to "pants-shittingly shitty" happened between season one and two, and is best evidenced by the difference in opening themes. Season One:
A very standard issue shitty TV action show intro. Notice the near omni-presence of a Miami Vice suit-wearing David Hasselhoff...