Maybe they are grinding up garlic or onions or who knows what.

If you would prefer to do it on your own than that is fine too and you will just have to grind it out and save like crazy but it will be worth it.

I am exploring this area and have heard some noise regarding the further limitations on beach access points along the coast, creating some havoc for str owners.

Noise ordinances as well.   

No complaints from neighbors about any loud noise or erratic behavior or anything.

I just recently started a jiu jitsu academy with a couple of friends, and although I was not in the day to day grind of the process in finding a building and building the space out, I did become fascinated with the process.

Challenge: It's in a neighborhood (no HOA), and renting the entire property (sleeps 25 in total) caused problems in the neighborhood, due to noise and parties – so we only rent the separate cabins now.

Also I would consider being a new agent in a market with no inventory and no buys will be a grind with little pay. 

Airbnb will send you a free Minut noise monitoring system (they did before) that can help monitor noise and parties as well. 100%I would add that your rates are too low if you are attracting these types of guests. 

If you make enough noise, and eventually do enough deals, you do make a good deal somewhere along the way.