Get bird netting stuff from a hardware store, hang it across the ceiling and hang leaves/vine from it. Looks really great.

Maybe magnetic fishing for piranhas?
They could craft jungle flower or bead necklaces.
Or craft jungle animal masks.
Or make huts out of ...something.
Or make grass skirts from streamers or brown paper.
A hunt always takes a bit of time...maybe a safari where they have to get a photo of hidden stuffed animals?