Congrats on the trip! You will love it.

The Cab Switchy is definitely a great choice, especially for beginners. Very floaty, easy to control, slower than others but that's good for beginners, and excellent depower and control.

14m is probably too big for you especially if winds pick up above 16knots. Check were you're going and study the average winds throughout the year and possible gusts. Last thing you need is windy days with a kite that's way too big.

I weigh 80kg and I have an older Switchblade (also 14mt) and found it a very easy to kite and control. Has great loft and jumping potential, so you have to pick the right days. If it's over 18knots, I would avoid even with your weight.

Consider two kites at least - 12mt and the 14mt, even a third 10mt for those windy days over 22knots. And if you lose weight, the kites become even more powerful. So be careful.

I would go for a slightly bigger board though being a beginner - around 140, 142.

Where in Costa are you going? In the Guanacaste region, when the Papagayo winds start in December, a 14 will be too big, even for a big guy like you. I'd take a smaller kite as well. 10/11m. Take a TT kiteboard as there are heaps of old surfboard lying around to ride if the wind is light, but no kite shops, when I lived there a few years ago. Awesome country.....enjoy.

Most of the winds will be off shore at that time, so you will be limited in where you can kite. I lived in Playa Flamingo and the wind was swirly and gusty in the bay there because it is coming off the mountains. In Bahia Salinas you will get straighter wind but it blows it's tits off. I reckon you will be able to kite 15-20kns with a 14/TT combo. May be a little more??? I'm 90kg's and drop my 14 at 18-20kns.