Movie title, actor, year?

I am thinking of a film. I think it was in the Predator or Alien series. There is a group of scientists in a foreign land, perhaps a rainforest or tropical location. They end up on the coast of somewhere and run through the jungle. Creatures are spotted, possibly extraterrestrial. The beginning features a house in this tropical area where they spot a creature through equipment they have and they have to protect themselves around the house. Towards the middle, they have to trod across a river with extra-terrestrial creatures behind them. They are at a cliffside, where they have a helicopter that was in need of repair. At the last minute, they and the chopper fly off, and the creature or creatures get ever so close to the chopper but fail to get it. The creatures duel.

The other movie I can't remember had a base around the Golden Fleece. They are trying to locate it and find it on a tree next to a steep cliff. They nearly lose it but manage to capture it.

All of the movies are between 1995-2006.