My parents have an old laptop ( Macbook ref ) wich start to lag on the last OS version. So I'm looking for a light distro to install.

They only use the laptop to go on internet (any browser) and use Open Office or equivalent. But I need a very intuitive distro 'cause they don't very understand how a computer works and I'm too far away for any computer maintenance (I just can install the distro for Christmas).

I hesitate between Ubuntu with an other DE than Unity (elementary OS?) or Linux Mint (lighter, but have a quite bad GUI) or buy the OS X Snow Leopard (past version of OSX).

Thanks for your help!

PS: I hope I have not made too many spelling mistakes... ^^'