Friends and former colleagues have since paid tribute to the couple who were from the Greater Manchester area.
The Good Rebel bar in Stockport, where Miss Thompson previously worked, paid tribute to her on Instagram, remembering her kind nature and “beaming smile”.
The bar wrote: “We have some sad news to share.
“Whilst on holiday Sarah Thompson, who used to work with us, was involved in a tragic accident alongside her boyfriend Alex and sadly passed away.
“Even though she left two years ago, Sarah was and still is a very big part of The Good Rebel, being with us from day one and helping make The Good Rebel what it is.
“She was the heart and soul of the place and left an impression on everyone who walked through our door with her beaming smile and welcoming nature.
“She was the kindest and happiest person you could ever meet and could rock a pair of dungarees like no other. We love and miss you Sarah x.”
Climbing gym Awesome Walls in Stockport, where Mr Barrett worked as an instructor, paid tribute to the couple on Facebook, remembering them as enthusiastic climbers.
