Follow the light
Tropical rainforest. Hot, humid, and less available light due to the dense canopy. My strategy (apart from using bigger aperture, very low shutter speed, higher ISO, or a combination of them all) has been to wait for moments when light is able to strike through the leaves. And depending the forest location, it will either be morning or late afternoon. Search for good spots where the sun lit the area, and use that to our advantage.
Here I used the broad leaves of Hibiscus tiliaceus (local: waru) against the afternoon sun to get the transparent vivid green colour showing the veins of the leaves.