Spouse and I have done some of each of: seller financing, rent-to-own, traditional rentals. We have not done vacation rentals.
fwiw, regulations on seller financing keep changing, so we haven't done any in the last 9 mos or so (it's not impossible, just a steeper regulatory burden & learning curve, and we chose to 'opt out' given our relatively low volume). Instead we are mostly doing rent-to-own with terms similar to seller financing; technically we structure as a lease-with-option. Local and state regulations vary...
Sounds like it's the hassle factor & lack of earnings on the asset that are bugging you - so outright sale or using a mgt company to do short-term rentals & maintenance might be best fits for you. *Unless* you can find someone with good maintenance skills and cash flow but bad credit (prior healthcare issue or some such, not ongoing don't-take-bills-seriously items), then they might make good rent-to-own clients for you (and be worth the research/legal fees to create a structure that complies with your area's regulations and makes your accountant and the IRS happy).
Completely outside the box, any charity you like that could use a residential/retreat facility? You could structure as full or over time donation if you could use the tax deduction or as a sale. Guessing this would make sense in 5% or less of situations, but just in case thought I'd mention it. You could even start your own charity ;)
Break out a spread sheet and compare the different approaches, see if one of them turns out to be a lot more attractive to you than the others. Include a category for 'hassle factor'. Good luck!
[warning - I tend to check the forum once every week or two, if I ever don't respond right away it doesn't mean I'm ignoring you!]