Pleasure Island tickets are:
$22.32 for multi-club, single night.
$27.32 for 5 consecutive nights
$10.60 for a single club, single night.
$59.59 for an annual pass
$105.44 for a dual annual pass ( two people every night )
All annual passes that can be used at Pleasure Island ( Premium annual, Pleasure Island annual and PI Dual Ann. ) all get a guest in free on fridays. You have to stop at the ticket booth WITH your guest first to pick up the free guest ticket.
You can also use Magic Your Way - Magic Plus Pack options, or Park Hopper Plus tickets. If you have a park hopper plus from before January of 2005 - and still have plus options on the ticket you can still use them, but there is a slightly special procedure you'll have to go through. Due to changes in WDW ticket media, and ticket options post-MYW, your older Park Hopper Plus will not work at 5 of the 7 clubs. You can still go to all 7 clubs, but you'll need to "check in" and be scanned at either Adventures Club or Comedy Warehouse first - then hop to all the other clubs with your stamps and wristbands. You can also get the ticket "fixed" at the Pleasure Island ticket booths, but it is much easier to walk to one of the two comedy clubs instead of waiting for the CM to "fix" the ticket. Pleasure Island is the only place I am aware of that is effected by the ticket media change in such a way.