Ah, Far Cry is a good choice. Say, when is 3 coming to GOG? I would get it on Steam but fuck Uplay. I would even rebuy Blood Dragon here.

There was Tarzan too!

Men Of Valor is very jungly (it takes place during the Vietnam War, in South Vietnam). The whole game is basically jungle and rice paddies.

Not exactly jungle but... Metal Gear Solid 3.

Well, there's Congo: The Movie - The Lost City of Zinj, which was a Sega Saturn exclusive....and also a really bad game. I actually recorded a video of it earlier this year, so you can check it out.....if you dare!

I think there was another Congo game that was exclusive to PC, but it was a completely different game.

Would this game count? It is currently on GoG. It makes me think about jungles and that sort of thing whenever I look at it
The Curious Expedition

Magicka: Vietnam

Day One: Garry's Incident.

Lands of Lore 2, for most of the game.
Aztaka, a side-scrolling Action RPG.
Capsized takes place in some kind of alien jungle world.
Two Worlds 2 has a desert continent and a jungle continent.
Driftmoon.
Expeditions: Conquistador.
Risen 2 and Risen 3.
Serious Sam First and Second Encounter to some extend.
Braveland Pirate, for most of the game.
Ys 6, for most of the game.

Edit:
And Diablo 2, of course, has a whole jungle act.

There are a few open world action games set in jungle-y environments, but in all of those cases most of the gameplay happens in urban areas and on the roads. The Just Cause games for example. Then there's Mercenaries 2 (don't know about the first game). Also there's Boiling Point: Road to Hell, but it's not exactly a game worth playing.

pitfall

Myasmata;
The Forest (erm...);
Far Cry 1, 2, 3;
Crysis & Crysis Warhead;

Dear Esther

Pitfall is another one of those ones that seem so obvious once it's said but that I wouldn't come up with at all when pondering the question. The Curious Expedition sounds pretty neat too. Miasmata looks like it could be pretty fun. Also it looks like Indiana Jones and the Fate of Atlantis has a bit set in Mexico, and the Monkey Island games are set in the Caribbean.

As much as I love Dear Esther, I'm not really sure the Hebrides are particularly tropical.