Ozon, welcome Pirate! You can bring outside food and drink for your room, but BB frowns on guests dipping into their personal food and drink stash when in the public areas, such as at the bar, restaurant, Jacuzzi, etc. Other than that, everything is how you make it. For example, I don't do overnights but other guys love it. Remember that the chicas are just workers. They are not in love with you. Whether you are in Sosua or at Blackbeards it is often best to get to know a chica for a bit before suggesting a TLN. Otherwise she may try to bail on you midway through the TLN. Those women are humans -- not robots. They are not in love with you and nor are they all super horny. For most of them it's just a job. Same as in Sosua.
As for activities, go to the BB site and sign up for the newsletter. Also read the BB website. Most of the activities are leading up to and during the weekend. Other information is available here on this website as posted by other BB vets. Also, don't just go the BB and then return home. Carve out at least a few days to visit Sosua so that you can enjoy the complete mongering vibe in the two areas.
Have fun and enjoy.