Mongolia / Brunei / Laos

Can't really help but what were your favourites besides the typical Japan/Korea/China/Thailand if you don't mind? And why?

Don't remember there being much to do in Brunei. You can visit mosques, some 6* hotel, an amusement park, floating village...

I went to Luang Prabang for a few days and it was very relaxing after a month of traveling in Vietnam and Cambodia. A friend suggested going there instead of Vientaine because after Luang Prabang you'll probably have your fill of temples, and the ones in Vientiane pale in comparison anyway. Since there's virtually nothing else to see, you can easily cut back to just a day in Vientaine. The one thing the city has going for it is food - there are a lot of good restaurants. Enjoyed Luang Prabang but it was more relaxing than wow though was interesting to see the monks in the mornings during their walks and the food there was pretty good as well.

I am just pasting his notes to me on other places in Laos which I didn't get to for lack of time:

You might want to consider stopping at Vang Vieng for a day or two. I've never been, but everyone seems to love it. Apparently you can avoid the drugs and booze-ups by staying outside the town in the countryside. The other place that's nice is Nong Khiaw, on the Nam Ou river north of Luang Prabang. You could probably take a boat one way and a bus the other.

If you extend your time in Laos, it's worth heading to the 4,000 Islands in the far south or the Plain of Jars in the northeast. The south feels quite different from the north, and is incredibly relaxing. The Plain of Jars is one of the more interesting places to visit in Laos, but the weather usually sucks and you'd probably want to fly in.

Have fun as it is always interesting to see new places and experience different cultures.

EDIT: Thought I would add that Luang Prabang was pretty enjoyable because the locals were pretty chill. Unlike Cambodia or Vietnam. people were not trying to get you to spend money. A lot of reasons for that but it really made the time that much more enjoyable. Like much of the region big French influence that can be seen in the food. This was about 6 years ago, hopefully, it is the same now.