Converting my property's garage into another Airbnb worth it?

[Benjamin Barry]

I have a rental property in the Southeast (not my residence) that I am using as an Airbnb.  It is worth about $80,000, so not very much.  It is in a lower middle class neighborhood and so far is doing okay.

I am thinking about what my next move would be and I would like advice.  I have the option of either:

1) Converting the existing detached garage of the $80K property into another, smaller airbnb.  It already has a separate room attached to the one car garage but there is no HVAC or water.  I would want to do this with a construction loan of some sort.

2) Just buying another property and saving the down payment for that.  Right now my Airbnb is not in a vacation market so I'm thinking about my next Airbnb being in such a market.

3) Any other ideas??

Thanks!