Zig Zagged: The VPPD can handle it...until a key point when Bob is called in...but that was really all they needed him for, so he's free to relax after that.
Averted: No murder happens while Bob is on vacation.
Enforced: "I'm tired of placing the show in Murder Heights! Can't we travel to a more exotic locale?"
Lampshaded: "I swear, I'm going to fire my travel agent."
A notorious crime boss who's keeping tabs on Bob makes sure there's a murder in his vacation spot to screw with his vacation.
Da Chief doesn't want his best detective to get any downtime, so he suggests a lovely little holiday spot... where he happens to know there's been a string of bizarre murders recently.
"You know what? I'm on vacation. I don't care if there's a murder. You have your own detectives, so you can solve the case yourself."
Alternately, he offers his support over the phone, which is enough to get the VPPD to solve the case.
Bob plans his vacations in isolated locations with no cell phone reception and nobody else around to be murdered, just to make sure he can avoid his job.
Discussed: "Alright, vacation at last. Given my luck, though, I bet someone's going to die at my vacation spot or something."
Conversed: "Why does this always happen to poor Bob? You'd think he'd be able to take a vacation without getting bugged all the time."
Bob's wife points out that just because someone's been murdered doesn't mean he, personally, has to solve the case. Bob struggles to draw the line between his private life and his work, and get over his Chronic Hero Syndrome.
After one too many vacations being interupted by his company calling and demanding he work at those times, Bob decides to sue his company for breach of contract.
Bob struggles to cope with the lack of relaxation and his increased stress levels, leading him to get progressively more frustrated with his job and lack of a proper private life.
Reconstructed: Bob reluctantly abandons his holiday, calling his own department to get himself officially assigned to Vacation Point for the duration of the case and explaining to his wife that they really need him for this one, but they can book another holiday.
I'm on vacation, so someone else can edit this...oh, fine, back to Busman's Holiday.