The second option you have is food trucks – although you really have to be weary on this one. Don’t be afraid to ask them what the ingredients are, as the food is made fresh and they’re usually proud to tell you what’s in their food. Luckily, we encountered a Paleo food truck while in Portland called Cultured Caveman (pictured below) that served some keto friendly items.
Another option is Thailand, and Phuket has the most family-friendly beach areas. You could get a family hotel room at one of the many beach resorts that has a Kids Club in addition to swimming pools and the beach itself. Those are my top suggestions for a family trip that is also suitable for an anniversary. I hope this helps. Let me know if you have any other questions. -Roger
Another reason to consider Dubai is that the busy airport has cheap non-stop flights coming in from almost every major airport in Europe and Asia. As a result it's popular to book long weekend trips of 3 or 4 days to Dubai, where you can enjoy some sunshine and shopping before flying back home where it gets colder by the day. You might also consider stopping for a few days in Dubai and then moving onto somewhere else with cheap direct flights such as the Maldives.
Hawaii, as you probably know, would be great for what you have in mind, except that there are no cheaper options there at all. After that I agree with you that there are places in Mexico that could work. One in particular that I like a lot is the area around Playa del Carmen, which is just south of Cancun. It’s a lively and tourist-friendly town, instead of a strip of big hotels like Cancun, and there is a wide range of activities and accommodations in different price ranges.
Traveling in December means you either fully lean into the holiday season, or else escape it entirely and flee to somewhere warm. Personally, I try to appreciate the cold weather while we have it and max out on warm seasonal beverages, colorful lights, soft snow, and good company. True, some places are overwhelmed by the capitalist engine that powers Christmas, but you can still get a non-denominational-winter-wonderland fix, if you know where to look. No matter your travel preference, there’s a perfect place in this world for you to bask in those final sunsets of 2018.
Costa Rica is kind of the Thailand of Latin America in that they have great tourist infrastructure and it’s the easiest place to get around. They also have a lot to offer with the beaches on both coasts and many natural sights and activities, plus of course the Arenal volcano, which is a really nice area. San Jose is best as a place to just pass through on your way somewhere else.
I’m not really an expert on surf destinations and even less so on skate parks, although I am aware of many places that do have good surf beaches. From Ireland I think your two best bets would be either Rincon, Puerto Rico, which has the best surfing in the Caribbean and is good for longer rentals like that. You could get a reasonably priced flight into San Juan, which is also a really nice place with some surfing and great beaches, and then hire a car for the drive to Rincon.
The hotel rates all over Goa are highest in December and January, but in Anjuna or Vagator they still start at around £10 per night for a private room with ensuite. The cheap places are quite shabby, so it might be worth spending more. Vagator has an amazing beach, but it’s often filled with Russians these days. Anjuna is famous for its beach raves and music scene, but I’ve honestly heard nice things about many other beach areas in Goa.
Located off the coast of East Africa, the Seychelles—an archipelago consisting of 115 islands—is about as close to paradise as you can get. Crystal clear water, lush jungles, and powder-fine sand make it the ultimate early winter escape, particularly for romantic getaways. Book one of the 30 breathtaking pool villas at Six Senses Zil Pasyon, which is among the region's top luxury resorts. The hotel is situated on a private island that offers prime territory for snorkeling, sailing, kayaking, and hiking—plus, the spa has scenic pavilion-style treatment rooms that are worth the trip alone. Health conscious guests will be particularly impressed by the property's new "Eat with Six Senses" program, which is intended to make travelers leave vacation without the guilt that comes with overindulging. There are four tailor-made treatment plans that focus on sleep, detoxing, fitness, and more, depending on the issues you prefer to address.