I should say that I was really happy to go to the jungle in Taman Negara. We went by bus from KL to Jerantut and went directly to NKS Hostel to arrange the Jungle transfer and activities. We went to Kuala Tahan by boat for almost 4 hours, it was a really nice trip but maybe quite long, anyway strongly recommendable to do at least one way and comming back by road with the public bus. Once there, I started to be dissapointed because the tours and activities are too much touristic in my opinion, and also I was dissapointed with the accomodation. All the accomodations there (except the Muniara Resort) are really bad, I think they offer basic and bad options because they know once you are there you will spend the night anywhere cause you have not any other option. We couldn't do the Skywalk because of the weather but it seems to be nice, all the other activities seems to be too much done specially for the tourists. At night we went to get dinner on a floating restaurant and we loved it!
In my opinion is a good option go to Taman Negara but with not much expectations. Take into account also if you went on low season (Monzons season) that the weather could be a bog problem to do the activities.