The Castaway Club levels and their perks are listed in the FAQ sticky at the top of the boards.
But there is only 1 FAQ sticky.There are 6 stickies, so it took a while to figure out which one to link to, but here you go.....
But there is only 1 FAQ sticky.
There is also a chart on DCL's website that gives the breakdowns of the levels and their associated benefits. Once you log in to the Castaway Club site you will be able to see the chart.