
Vaccinations – You should consult to your doctor about this. Ask for the medicine you may need and set vaccinations before visiting Borneo.
First aid kit – It's important for great adventure tours that you always keep with you a decent first aid kit with everything in it waterproofed, sealed and in-date. There are many pre-made kits out there on the market. It could be very helpful for your adventure.
Food – Get information of foods you should and shouldn't eat. Make sure food is cooked thoroughly; avoid salads if you think the food hasn't been washed properly. It is very important that you prepare yourself for the worst because it doesn't matter how careful you are, you could get a dodgy tummy sooner or later and that wouldn't be great adventure tours anymore.
Water – You'll need to drink lot of water during your adventure activities. So have a good water bottle (or two) and make sure the water you drink is of a good quality. You could take along with you a means of water purification. Iodine is good for short term emergencies.

Water – running water in places might be intermittent. Pack your wash kit with things like all-in-one soap or a shower gel. Learn how to improvise by making your own showers out of plastic water bottles or a water bag.
Electricity – in smaller towns power cuts can be frequent and when you get off the beaten track you'll be lucky to find electricity. So a head torch and spare batteries are essential.
Roads – poorly maintained roads can mean transport delays so keep an open mind regarding timings and schedules. Don't plan a long bus journey right before your return flight home.
Those guides for great adventure tours will be handy for you. Just have a try!
I suggest you check out my other guide on Padi Dive and Bali News