Hi Sue
I can agree with Martin, (Hi Martin) this trip was Brilliant.
This is the first time I've managed to get on the forum since coming back so catching up.
Both before and in the jungle were very casual, there is really no need to dress up. A few of the group did dress up a bit more for some of the evening's when in hotels but it was still very hot and humid into the evening's so I suggest comfort over anything else.
I loved his tour from start to finish (I did Singapore as well) but the highlight most definitely is the time spent in the jungle....... cruising down the river wildlife spotting. Absolutely amazing and the chance to see Orangutans in the wild.
There's probably not really much other advise to give.......there are a couple of long drives, with enough stops on the way, aircon on the coach helps alot and views to pass the time. Make sure you go and explore a bit when in Kota Kinabalu.........the fish market/street food area is worth a wander around , if for nothing else but to see the array of things available, a popular place for the locals.
This was only my second JY trip but was definitely a trip of a lifetime.
If there's anything else you want to know, I'll do my best to answer.
Paula