However, I thought what a great opportunity to utilize my beach house as a Short Term Rental, and I listed it on Vrbo and tapped into the greatness of BiggerPockets.  

Should I invest that money in the short term?

Borrower short on a variable rate (HELOC), borrow long with a fixed rate.I can potentially do either for you but would suggest a fixed rate either first or second mortgage. 

Hi @Andrew Singh      If you are using an LLC, I assume you would be using hard money (short-term loans) and/or DSCR loans for long-term holds?

I'm comfortable analyzing a deal, I understand I'll need to get an LLC in order to get a short-term loan, and I know I'll need to find a lender for the refinance, but sourcing bids is what is currently hanging me up.

Appraisers are typically pretty conservative and will use long-term rental rates, not mid/short term rates.

If its a popular area for vacations you could do a short term rental.

I'm putting a business plan together for a short term rental and I can find plenty of data from comps on projected vacancy rates of established rentals, however, I know I can't expect to come out of the gate with 50-60% occupancy.

Short version. 

Use the HELOC, take a small hit on LTR in the short term, and grab another when you can.