One Step Forward...and then a step back

Well, my Vegas roomie/travel mate has determined that it is not possible for her to go to Vegas after all.  This now opens up questions for me.  Do I try to find someone else to go with so I can share expenses and not end up lost wandering the streets of Vegas?  Do I try to book at the same time as one of the other couples going?  Do I really want to be the third wheel (7th wheel actually, I guess...since there will be 3 couples and me).  Or should I grow up and put on my big-girl panties and get my own self to Vegas like a real adult would?  hmmmm...