We had 80+ guests at our ROR wedding. We had our "Welcome Party" 2 nights before our wedding on the beach at the bar there. I believe it cost $10pp for drinks and everything else - tables, chairs, tiki torches, set-up, etc. - was free. Chandlyn set everything up herself, hung up a banner we brought with us, hooked up our ipod music stuff. It turned out great.
For our rehearsal dinner Chandlyn reserved tables at the Plantation for us for free.