From England I would say your cheapest and best late December destination with warm weather and reasonable prices is going to be Phuket. There are some other Thai islands that might be a bit cheaper, but they would be more complicated to reach, and they’d have fewer activities for the boys. Here are some Phuket resorts good for families. You can see that the price range is wide from cheapest to most expensive. In late December it’s peak season so you’ll pay at or near the top of those ranges.
It's getting cold out there, so consider a journey that leads you into a warm museum. Whatever your interest, there's bound to be a specialized one to engage it. If art and sculpture are your passions, discover some favorite art museums around the world. And consider that you can make a day of it soaking up culture as many contain surprisingly good restaurants to visit in between your viewing.
I haven’t followed the Zika list, but I do understand the concern. Since you aren’t big beach people, you might just bring jackets and go to a more romantic city like Paris, and then maybe down to Nice for part of the trip and something a bit different. I’m not sure if this is helping, but if you have any questions about any of this I’m happy to keep trying. -Roger
We are looking to explore warm Central American destinations safe for kids and affordable in price. We love beaches. Not in the typical sun-bathing type of way, but rather appreciating the raw beauty of the nature. We also like to eat out and having activities for the kids and as a family would be excellent. Could you suggest a destination that fits the bill? Central America appeals to me but open to other suggestions you may find worth mentioning.
I’m hearing very mixed things about Cuba visits. The main downside for Americans is that you still have to go as part of a package deal, and those packages are all incredibly expensive for what you get. It sounds like the Cuban government is charging very high taxes and fees on companies selling tours to Americans, so they are really only popular among people who are especially curious about visiting Cuba. In other words, they are poor value unless it’s at the top of your list already. I hope this helps. Let me know if you have any other questions. -Roger
Without knowing more about your interests, my top suggestion would be to focus on Sydney and Melbourne and the areas around both. The Blue Mountains near Sydney are also nice for a couple days or so. The main challenge you’d have in seeing a lot of Australia is that it’s all so spread out. You can hire a car for Melbourne and Sydney and that whole area, but it’s better to fly to get to Uluru (near Alice Springs) or Brisbane or Cairns/Great Barrier Reef or Perth. You’d be driving for days in between those places if you started from the southeast area where most people live.
If you’re a bit more on the timid side, you can always use Yelp and TripAdvisor to get good insights on places people have visited. As a disclaimer, some of the ratings may not be accurate on these sites, so make sure you go through and read some of the more recent reviews that people have written. We did this for a few of the places we visited and had no issues.