de_insula_v1
Until Valve integrates CS:GO into Steam workshop or at least makes a menu fix grumble grumble... What was I going to say? Oh yeah you'll have to type "map de_insula_v1" into the console. (Minus the quotations obviously.)
I'm currently working on some updates for the map. If you have any suggestions for how I should improve the map, I'd be happy to hear them!
DL#1 http://filesmelt.com/dl/de_insula_v11.zip
DL#2 http://www.gamefront.com/files/22304498/de_insula_v1.zip