Gotta agree with the above; sorry, you are, but as an American you are acting as our culuture has instructed us - be polite, don't cause offense, et al -
So, you are acting way too "American" - remember, you call the shots in Costa Rica, and while I never advocate anyone being an ass, I also don't say you have to proceed with such an abundance of caution that you are overly worried over offending hookers
You really don't have to pay them for their "time" especially if you are dancing but I always think a little up front honesty is welcomed "Look, I'm not wanting company tonight, but if you want to dance and have a few drinks, thats fine"
You are under no obligation to buy random girls, especially those you have zero interest in (and ther friend(s)) drinks. A simple "No" always works) - Especially after they have asked you the time honored questions:
Bacation?
U firs' time baby
Where u stay, baby
I wait for you baby
Won drink fo me baby
So f.u.c.king annoying - especially the over use of the word "baby"
Take no personal offense at my next comment, but Jesus, what a phucked up society we are when so many of us are so worried about giving offense to hookers (which is the 'theme' of your post, basically - and so many of us were the same way
)
.
Let me make a suggestion - a private tour would be great - use the PM function to contact Bilko and see what you guys can arrainge.
So you like Dominicanas, huh....well the good new is there are often many in San Jose - so with any luck you should be looking into more black holes than the Mount Palomar Obsevatory, before you can say "Yo Mama"