How to make travelling with kids easy?

I recently came back from a KL trip with a 7 year old daughter & 6 month old son. . We took coach so the ride up and backwas pretty long but we survived! For my daughter, I packed story books and colouring books to keep her preoccupied with snacks and for my son, we took the morning coach so it was easier to handle him since he's so sleepy. I also packed lots of small tons that will entertain him but he was more interested at staring outside the window lol. I carried my son everywhere in a babycarrier (I used Ergo) and since we were in malls most of the time, changing and feeding him was pretty easy.