Our place is a lot like yours. It is in our yard. We have chickens AND ducks -- which are actually noisier in the morning! Your place is cuter than our dirt yard in AZ. And in a high traffic location. You have tons of good reviews.
I agree with others here, reduce your occupant limit. We tried 4, too, but that is just too many. Now, we have 3 as the most -- and no children under 12 due to the creek. You could take younger children, but child-proofing is very important.
I have stayed in nice Park Models like yours, they are a great rental. I would tout that, "New Park Model with full kitchen". You will have lots of great reviews. I listed our old vintage "bunkhouse" in the tiny house category, so people will not expect a lot of space! I have stayed in a YURT in your area, for the price you are charging. I would stay in your place in a heart beat, and have stayed in Gold Beach, Or in a very similar place many times. We love to drive the Coast Hwy!
Ted & Chris