Step 1 : Go to this website : http://www.whatstheirip.com
Step 2 : Enter your mail id and click get link. See the image for details.
Step 3 : You'll see 2 links, Just copy either one of the link and send to your victim and make him open it, say "check out my new pic" or something like that (Don't open it by yourself).
Step 4 : Check your Inbox in the mail provided in step2. You'll see a mail with an IP address, You got his IP and Geo Location !!
When your Victim or Friend opens that link he'll see an error page and he'll think it as a random error.
