Take the first portal (green).

You step through the green portal. There is a flash of green light and a sensation of falling...

When you open your eyes, you find yourself lying in a rainforest clearing. You are wearing a loincloth. You appear to be uninjured. The clearing is open to the sky above and is covered with soft grasses and ferns. Dense rainforest surrounds you on all sides. It is hot and humid here and you can almost see moisture rising from the plants around you.

A narrow trail leads from the clearing deeper into the forest. The trail splits into three a little way along. You can go left, right, or press on.