Ask reality show guru Mike Fleiss (The Bachelor) about his new project The Real Gilligan's Island, and he quotes song lyrics: ''No phones, no lights, no motorcars, not a single luxury.'' But TBS' update of the '60s comedy (premiering Tuesday, Nov. 30 at 8 p.m.) isn't exactly primitive as can be. Not with a hefty cash prize, challenges ''sillier'' than those on Survivor, and cameras stalking the castaways. Fleiss selected two groups of seven contenders in the mold of the original characters including Rachel Hunter and Nicole Eggert as the Movie Star and stranded them off Cancún to see how the wreck of the SS Minnow might have played out in real life. (The goal: making it to the final seven and getting off the island.) For Gilligan creator Sherwood Schwartz, an executive producer of the new version, it offers a chance to capitalize on the popularity of Lost and Survivor. So expect some adjusting. ''When I did the original show, you were not allowed to show a belly button,'' he says. ''You were not allowed to show too much cleavage.'' And to think people still watched!