The Tu Lan system is the most adventure-oriented cave experience in the park accessible without booking many months ahead. Tours range from a single day to four days, all involving a combination of trekking, river swimming, and cave exploration. The caves themselves are less dramatically large than Hang En or Son Doong, but the experience of moving through them by water — floating on your back through passages where the ceiling skims the surface — is unlike anything else in the park.
The Tu Lan loop trips are operated by Oxalis and include nights in jungle camps beside the river. The one-day version gives a taste; the multi-day trips allow deeper exploration of the system. This is the best option for visitors who want genuine adventure without the year-long wait or the budget required for Son Doong.