Anonymous wrote:I second the rec and sport activities. There are tons of formal leagues, and many informal ones as well (kick ball comes to mind).
Since you are moving to Bethesda, take a look at the Montgomery County Recreation Dept. offerings.
http://www6.montgomerycountymd.gov/rectmpl.asp?url=/content/rec/thingstodo/sports/index.asp
They list the adult sports leagues, and provide links to indoor pools. Rockville City has an indoor pool, but it's on a separate web site.
However, getting a part-time job somewhere that caters to young adults might be the easiest way to meet others. Starbucks, a book store, etc.