1

Hi,
One of the best things I have done was to visit Tanjung Puting National Park.
You get to see a lot of wildlife and the orang utans are marvelous.
Best of all is staying on the housebout on the river, right beside the forests.

2

Are there any River Trips in Kalimantan that are worth taking...like on the Mahakam River?
I know about the Mahakam river trips. Most take tourists to the Dayak villages.

Is there much tourism there...?
Yes, some.

If so...are there Losmans further up river
Yes, in the villages along the Mahakam.

and are the boats booked from place to place or for the whole trip
The Mahakam is the "main road" for the people who live along the river system so there are boats going from place to place. If you want, you could charter your own boat at a higher cost.

Any health and safety issues
Yes, I have a friend who developed a stomach problem after doing a trip and it was several months before he was completely better.

He and 3 other friends crossed from Samarinda to Pontianak, and thought they wouldn't see any other people once they got into the interior. Well, they encountered about a dozen groups of people doing the same trip -- some going east to west, others west to east -- and missionaries stationed in the middle of Borneo.

Like headhunters
Should not be a problem.