Southeast Asia is easier to deal with, and there are cheap flights connecting in the Middle East and landing in Bangkok, Kuala Lumpur, and Singapore. Each of those is a very interesting city, and there are many smaller places to go in the same region. In Malaysia there is Penang and Melaka. In Thailand there is Chiang Mai and quite a few others in that area. In Laos you can visit Luang Prabang, which sounds like it could be a winner for you. And there is also Siem Reap, which is home to the amazing Angkor Wat temple complex.
Cartagena is a lovely place as well, but another reader just pointed out that the US government has a new travel warning to all of Colombia as of June, 2017. The US has travel warnings to many countries that people still safely travel to every day, but it is something to consider. Many years ago Colombia had quite a few problems, and yet Cartagena was always okay because it is this little cruise port and tourist city far away from the major urban centers. Seeing this, I would think twice myself, although I wouldn’t rule it out, but I also wouldn’t go anywhere except Cartagena at the moment.
It would probably be a bit more expensive, but another idea that could be great would be to fly to San Juan, Puerto Rico, and rent an apartment for two weeks. It’s a wonderful place that is family friendly, and rental apartments can be good deals. It’s obviously peak season there as well so nothing will be cheap. But the weather will be fantastic and the beaches are great, even in and near the city. I hope this helps. Let me know if you have any other questions.
Thank you for the kind words. I know what you mean about the image of Thailand and Bali, particularly among Australians. On one hand you could go to either of those places and easily avoid the most notorious party neighborhoods, but it’s probably easier to head somewhere else since both of those places are so crowded that time of year anyway. I do have a few suggestions, which I’ll describe briefly and then if you want more details about any that appeal to you I can do that in a follow up comment.
You mention New Zealand and of course it’s summer there then, so it would be a good choice. However, all of these places will be crowded and near peak hotel rates if they are warm. So I’ll be happy to give you advice if you tell me if you’d rather visit one or more European cities in the cold season, or if you are looking for a warm place like New Zealand where it will be fairly crowded. By the way, the southern European cities such as Rome and Barcelona are lively and enjoyable that time of year, as the Christmas season goes on, and there aren’t too many tourists except for a few that travel to see their families around the holidays. So it can be a good time for southern Europe, as long as you don’t mind wearing a jacket or jumper during the day, and maybe a bit more in the evening. Give me a bit more guidance and I’ll be happy to try to help. -Roger