[dba-SQLServer] copy a database

I need a demo database and it would be so easy if I could just copy 
AdventureWorks to the SAME server and rename it, but I can't seem to do 
that. I don't have the Copy Wizard either.

Any help?

In the end, I'll probably just create a new database and populate a few 
tables for the demo, but seems like too much work -- should be simpler.

Susan H.