I would suggest a paypal contribution of 10-20 per person. I would also suggest getting in on the raffle when you get there. Lilricky put forth a herculean effort in getting some amazing raffle prizes. We are very fortunate to be supported by this wonderful hammocking community and major companies like REI, Sawyer, and Garmin.
If you have a compass you might want to bring it. If you want to kayak you can bring your own or ask to use one that belongs to someone else. Timberrr is willing to loan out one of our kayaks if there is an interest.
If friends are coming as well, consider car pooling. Parking may be tight.