If you can ignore the fact that an Earth-like planet populated by American Indians is unlikely in the extreme, The Paradise Syndrome should prove to be hugely enjoyable: it has excitement, it has drama, it has love, it has tragedy. And it has Kirk having lots of (offscreen) sex with a leggy native beauty (played by former Playboy bunny Sabrina Scharf), the couple blissfully unaware that a massive asteroid is heading their way.
Landing on the planet, Kirk, Spock and McCoy discover a strange metallic obelisk too advanced to been created by the indigenous people; while Spock and McCoy scout the area, Kirk takes another look at the obelisk and accidentally operates a trapdoor, falling inside and activating a machine that knocks him out. McCoy and Spock cannot find Kirk and are forced to return to the Enterprise without their captain so that they can try and deal with the oncoming asteroid.
When Kirk regains consciousness, he exits the chamber, his emergence witnessed by native women who mistake him for a god. While Spock is attempting to destroy the asteroid and decipher the markings on the obelisk, Kirk is living it up as a deity, winning the heart of and marrying hottie Miramanee (Scharf), much to the annoyance of her previous partner, medicine man Salish (Rudy Solari). Of course, Kirk's happiness has to come to an end: when he is unable to re-enter the chamber and save the people from the impending darkness (caused by the approaching asteroid), the tribes people turn on him and stone him, also bludgeoning poor Miramanee in the process.
Spock and McCoy turn up to save the day, activating the obelisk (in reality, an asteroid deflector installed by an advanced race) and restoring Kirk's memory, but unable to save the life of Miramanee, who was carrying Kirk's unborn child.
8/10. Yes, there are plots holes, but for me the positives easily outweigh the negatives.