My basic assumption is I would be trading a certain level of cash flow for increased appreciation over a period of 10 years.

From your options, #1 is a big sink of cash and I can't tell how much that increases you rent. #2 is a no due to cash flow negative. #3 is the way to go.

Louis Fed shows the delinquency rate on residential single-family mortgages, and proves there's a way to spin this data to show that delinquencies are increasing rapidly.

The median price in the greater Austin MSA increased 2.4% to $435,000 over the same period.

Are you planning to hold as-is and focus on cash flow, or do you have a strategy for infill, increasing rents, or improving park infrastructure to boost value?

When you mentioned that you don't have a lot of money to start with, I'd recommend focusing on increasing your current income and decreasing expenses.

Are the units rented at market rate, or is there room for rent increases?

I would do this first before engaging an agent unless you are extremely active.

By accepting pets, it not only has it increased my cash flow per stay, but it has opened up my place for more bookings. 

Demand is increasing as India/China economy is growing, while number of Teak trees are diminishing.- Even if all of you reading this planted a 1,000 acres; that would not but a dent in the demand, and decreasing availability.- If the world goes into a recession or depression.