Arch Expeditions now providing jungle access via a Nether bypass. Enter at your own risk. The route *should* be secure, but it is the Nether...
Go to the nether portal hub, and enter the tunnel to Aphix's portal.
At the bottom of the stairs turn right for the path to jungle.
When you come to an intersection, straight through please. The side turns are
Continue along the passage -- it takes several more ups/downs and turns, eventually reaching the jungle portal.
On the other side your adventure awaits. The portal is in a safe room in case you arrive at night, the rest is up to you.