For example, we recently had 3 vacancies that we had to fill at once and some inquires slipped through the cracks since we advertise on multiple platforms.

captial partner is probably what your looking for.I would advertise on Pace Morby's facebook lots of beginner investors on that site that might do deals like this .. most experienced investors wont do gap funding based on risk. 350k unsecured line from a bank is really good those are hard to get.

I've noticed a lot of coffeehouses decorate their spaces by advertising local art that customers can purchase.

It is just false advertising in fact. 

Basically, you have to know that they're advertising the property based on a best case scenario. 

If you price your rentals at a reasonable price and stay steady with advertising and showings it should go.

You can search for members and see the agents (alongside everyone else) in Seattle but the only way to show up on a list of agents is to pay Bigger Pockets for advertising (currently $2,000 / 25 leads here in Seattle). 

have you check the seasonality of tourism to Yosemite area ?

If they don't use them, then you can advertise and rent out to anyoneGood Luck!

Quote from @Rachelle Bisaillon: I recommend you include some of your key qualification criteria in the advertisement.