Cash Out Refi or Pay off Mortgage?

[Chris Daniels]

So my first house is almost paid off, (I currently have 6 years left on a 20 yr mortgage).  I have had the same renters in this house for 9 years.  I have not really done any other investing in rentals.  I had another house I bought, lived in and sold.  I currently do not have a mortgage for a primary residence either.  So, I currently have a lot of flexibility at this particular stage in my life.  My question is, what should be thinking about doing?  I have roughly $100,000 of equity in that rental.  Should I do a cash-out refi and look for another rental property in a better area? Or pay the mortgage off and start banking the rent (although this will affect child support I am told).  What should I be looking at? 

(note: I am not interested at all in doing flips!)