Download Go here: https://golang.org/dl/
I chose to use the installer
go1.5.2.darwin-amd64.pkg Installer OS X 64-bit 73MB
This will maybe take ten minutes, depending on your internet speed.
Then go through the installation process with this guy:
Once the installation was successful quit Terminal and reopen it. Type “go”, press Return.
$ goGo is a tool for managing Go source code.Usage:go command [arguments]...
Congrats! You installed the Go language interpreter.