I gave my 4-week notice yesterday. The story spread quickly enough and generally positive feedback from everyone. Immediate supervisor was surprised and bemused. President of the company said he was angry at me for leaving, but he'd get over it. Found out a couple of other coworkers are in very similar boats as me (i.e. take a few months off this summer, or OMY, then find something different). Two former bosses said they were sad to see me go but totally understood. The regional manager hasn't spoken to me yet, but I reckon that's fine, we're all super busy.
I'll broach the topic of how to administratively leave with the business department tomorrow or maybe next week if no one tells me what to do before then. It'd be awesome if I get to keep the company phone as it's been the only one I've had for 15years.