This film does make you realise just how good Harrison Ford was in "Indiana Jones" (also 1984) and how good Danny DeVito is in this - but as far as Michael Douglas and Kathleen Turner go, well they are really pretty mediocre. He is "Jack", the dashing rogue who ends out helping slushy fiction writer "Joan" through the Colombian jungle in search of her kidnapped sister - something about a treasure map. This adventure takes for ever to get going, but once it does it offers us a colourful and entertaining enough series of set-piece escapades with a beat-heavy synthesised score that works hard to compensate for some really inane dialogue from both. Kidnapper DeVito ("Ralph") amiably steals the scenes he features in, as the story builds to a suitably perilous - and predictable - denouement with big creepy insects, a waterfall, car chases - and everyone gets wet a lot. You get the drift. It's fine to pass an afternoon and there is some chemistry between the two, but it's all a bit of a pale imitation now and the comedic elements have not aged very well either.
I guess I was a bit more impressed with the leads in this movie than the other reviewer here, for I think they held up their end of a story that is, if anything, even more of a take-off on action movies that the Raider franchise. It is fluff, of course, with odd violence offsetting what is a rather gentle adventure. Good luck finding it on one of the streaming services out there. It is for sale or rent only at this time. I had a chance to watch it free, however, as I wasn’t about to buy or rent it. It is good, but not that good.