We have walked from the beach right onto CSA a few times. We don't swipe any drinks, once we got some info on their wedding package and once we just wanted to get the room number of our former room as we couldn't agree. The key I would imagine is to be a couple that looks like you belong there. Again, we didn't swipe any drinks or anything, just did what I said and left. I told my GF we could have easily hung out though, no one raised an eyebrow.