Some popular movies from the eighties were: Risky Business, Goonies, Ghostbusters, Romancing the Stone, Crocodile Dun Dee (but don't watch the sequels that came later.) Dirty Dancing, Three Men and a Baby, Rain Man, Big, Twins, Batman.
Masters of the Universe with Dolf Lundgren, Frank Langella, Meg Foster, and a young Cortney Cox falls into the ultimate cheese factor movie of the eighties for me, but it's fun. Superman II also came out in the eighties and is probably easier to find.
On the horror end, don't forget Poltergiest and Alien
On a More serious note: The Dark Crystal (puppets aren't just for kids) and there's a DVD out with a great documentary on the making of. Moonstruck, (one of the best movies Cher ever did) Good Morning Veitnam, Hope and Glory, The Last Emporor, Platoon, The Mission, The Color Purple, Witness, Cocoon, Amadas, The Natural, The Karate Kid, Flashdance, Gahndi, Tootsie, Das Boot, An Officer and a Gentleman, Chariots of Fire, Coal Miner's Daughter, Elephant man, Raging Bull.