Nothing major - a fun-colored pot, dish towels, a bowl of colorful fruit and flowers in the kitchen; a shower curtain and towels in the bathroom; etc.

And from there it's going to be 2 years (of birthday and xmas cards, of semi-annual "just checking in, how's the house going?"

I just visited Maui for the first time to celebrate my birthday in February so seeing your post made me smile :-)I would also suggest that you have a few trusted RE professionals wherever you're investing so that you don't have that fear and less stress.  

He even had flower planting on one bill.

ie, do they want a stump dug out or a little flower bed cleared or?

Hi Marisa,Worst case scenario drop $300 to $500 on a new (more quiet) A/C and say happy birthday to the upstairs owner.You'll need to know the amp draw and plug type of the old unit and its cooling capacity.

Wouldn't it be a radically wild concept to reach out with a monthly newsletter, birthday greeting graphic, holiday text or email, or some other POSITIVE feedback during the life cycle of their residency with you - other than "your rent is late"?

I'd even think outside the box and give every tenant a small gift of appreciation - a cake, flowers, gift card, etc.

I'm also looking to add a flower farm and speakeasy.

Have all those names first/last, phone, email, address, birthday, anniversary, etc.