Just general questions to help you think through this.
Do you think you can rent at $1/sqft a month?
If you didn't have the house in college station, and were looking at buying a rental in college station, would you choose your house?
Are you willing to lease it for just mortgage+taxes+insurance? How much cash flow on top of the MTI would you need to consider keeping it? Consider future repairs and potential management costs as well.
The most powerful part of rental property is leverage from only having to put 20% down. If you've got a 180k in equity in the house and profiting $100 in cash, and $700 in equity each month, is that enough return for you to consider keeping it?
If you pulled the 180k in equity out, how much would that accelerate you paying off your lake house mortgage? What about in your stock market portfolio?
That 180k could be 5 down payments on five rentals. If you're interested in being a landlord and cash flow, how far are you wanting to go?
Hope this helps.