Something else to think about if you don't have your own regulator is to find out their process for cleaning the mouth piece after they have been used.
I was certified in 84, when females getting certified wasn't a common occurance, at least around here, and I learned the hard way about using a rental. I"m sure now, since there are more people taking classes, that there is better control over how that is handled. Always good to check into though.
Also, watch the drinking when you are on a dive vacation. Saw bad effects from that happen to fellow divers. Always play it safe.
Haven't dove in about 5 years and this thread is making me want to get back out there.