Release by Topps in 1965, this set contains 55 cards according to the registry page at the Professional Sports Authenticator (PSA) website. Arranging the entire set in order and using it as a flip book creates two mini movies: “Gilligan in Action” and “Skipper Takes a Trip.”
Here are scans of four of the cards with one example of the back of the cards:

Gilligan’s Island – Card #20 Front

Gilligan’s Island – Card #20 Back

Gilligan’s Island – Card #21 Front

Gilligan’s Island – Card #26 Front

Gilligan’s Island – Card #37 Front
Did you collect Gilligan’s Island trading cards back in the 1960s? Were you able to collect the entire set?