How much kit is enough to ensure you capture the moment without being worried every step of the way that you may lose a small fortune?
My opinion: one camera and one action-cam is all you need really. Unless you're a professional National Geographic photographer you won't need much more than that.
Quite simply: a Go-Pro or any equivalent will serve you well. Make sure you buy some extra GoPro batteries and have a waterproof case with it. The beauty GoPro is that they will last you a long time. I'm still using mine from 2013- it may not shoot in 4K (I don't have a 4k TV anyway) but it gives a crystal clear image on all my devices.
I've seen plenty of second hand complete GoPro setups for about £200 which will serve you perfectly well- you'll generally get a few batteries and accessories included in that.
You could end up spending thousands here which really isn't necessary. Again, unless you're a professional photographer then a DSLR with a single lens will be absolutely fine.
As the camera manufacturers are continuously bringing out new versions, it's nearly always possible to pick up a bargain online. A DSLR a few years old will have all you need, then make sure you have a lens which gives you enough zoom e.g. 18mm-200mm. Whilst this may be considered by some to be a 'jack of all trades, master of none' it will mean that you only need to take one and won't need to swap lenses and risk getting dirt or sand in the body of the camera.
Don't forget to take all the correct chargers and batteries! In order to save space I bought a new DSLR battery charger which charges two batteries and can be powered by micro USB (the same as all devices we're taking).
Pictures of our charger-packing solutions to follow on the blog.