Okay, I've Purchased Extra Gear, Why Can't I Go Exploring? Solved, But What an Adventure!

You have to find the spot where you can clear terrain with the machete/your hands. You'll get the pop ups about something that your sim encounters. After that, you can "travel through" and that takes you to next part of jungle. If you already are staying at the jungle in a place, the adventuring is all about going around the jungle and exploring. There is nowhere you need to click on the map to start your adventures.