You don't say how much time you have before your honeymoon (congratulations, by the way!), but I would add to the advice above: practice, practice, practice! (er, I mean: practise, practise, practise!)
Take some time and take some sunrise/sunset shots at home; panorama shots; landscapes; portraits; whatever you think you might be shooting. It will give you an opportunity to get used to the camera and have a little more confidence in what you're doing when it counts.
Also, if your camera has the ability to shoot raw (not familiar with the RX100), save photos in both raw and jpg. With raw files you can do more post-production manipulation when you're back home and when you have more time.