I travelled with my little boy at his 11-month old. We join tour to Langkawi, I think it is ok. As we have two days free time in Langkwai and stay in the same hotel for 3 days. So it is good, no need to pack the luggae every day. The good point is no need to worry about the travel, but the time will be more restricted especially in dinning. My last experience is good as my tour like my kid and willing to pay with him.
So if you like to join tour, may be you choose not too much jounery and stay in the same hotel. such as Phuket, Sabah....