Other than Mr. Howell's trunk with millions of dollars, nothing. TV tells us that if you have coconuts, you have electric power. If you have bamboo, you have pedal cars and bikes. If you have a sitcom script, you have everything you need, from the power of flight to the means to escape to neighboring islands. Even to host the Harlem Globetrotters!

FWIW outfitting Amelia Earhart's Lockheed Electra is a mildly more interesting exercise than the SS Minnow. She and Noonan had definite weight issues, and maybe the hubris to think they didn't need even the basic essentials (ex. basic preps such as radio navigation skills).