The answer? Helping their families.
Proving they really are a power couple, the island's longest-lasting coupling have revealed they'll use their £25,000 each to treat their loved ones.
"I'm going to buy my mum her house and give her a deposit for it," said Cara.
Nathan added: "I'm going to take my old man on a golfing trip and take Debs to a plush hotel spa. Honestly, thank you all so much! Everyone who has been voting for us. Thank you!"
After being voted the viewers' favourite couple and winning the show on Monday night (11 July), the pair faced one final challenge: revealing whether they were in it for the money or love.
This year had a different twist: Cara and Nathan both chose an envelope. Nathan's was empty, while Cara's contained the whole £50,000. She had to say whether she'd share it with Nathan or take the whole amount herself.
Obviously she shared it!
Cara and Nathan had been coupled from the very first episode of Love Island and emerged as the island's strongest couple. They had been bookies' favourite to take the top prize.
"All I wanted to do was find a fella I could take home to mum and dad and I found him. Everything else is a bonus," said Cara.
Watch it all unfold below!
Love Island: Heading Home airs Sunday at 9pm on ITV2.
Fancy winning some GREAT prizes? Check out Reveal Competitions here!