I'm heading to Brisas and diving with Dive Paradise from the 18th to the 25th of October. I've stayed there twice in the past, and used DP both times.
In my experience, Dive Paradise offers two packages for the same price. Either two tanks in the morning and one in the afternoon on the cattle boat, or two tanks in the morning on a fast boat. (Six pack) I've used the cattle boats the last two times I've been there, and enjoyed myself immensely. Most cattle boats have plenty of room for lounging around during the transit, and during surface intervals. (Most have a sun deck) They also offer a nice snack in between dives. I'm using the fast boats this year, and I'll let you know how it went after I get back.
9 days!