Ok, some excursions will fill up quickly and others not so quickly. If an excursion is full, ask if they have a cancellation list and put your name down. If you do not get in with the Olivia excursions, one can always book with Vallarta Adventures or any other tour company, just know that you will not be with all womyn, like on the Olivia excursions. I have never had a problem doing tours outside of Olivia, they are safe and fun.
The Travelex desk is open Sat., 27th from 12-7pm and then Daily in the lobby area from 9:30 - 4:30pm for bookings. You will need your credit card to book these excursions, for they are not charged to your room. Unless Olivia has changed that policy, you would have to call them and ask this question.
Hope this helps all of you out.
See ya soon!