"Flat" bike route

Not too sure you will find as flat as WL around Raleigh/Cary. The link below is a route I have done a bunch. I think it is as flat as you are going to get for Raleigh/Cary/Apex area. It is a 31mi loop, but you can add another 17mi loop around Jordan lake by going straight just past 23mi (as you go over the lake) instead of turning left onto Martha's Chapel. By going straight at that point you will just repeat the course you did by starting at around 8mi point of original course.

http://www.mapmyrun.com/routes/fullscreen/29102550/

from experience, i say ride what you can at distance. You'll be fine. The wind is only on the 2nd half and the tar strips are friggin annoying.

I'll probably head down to do a test WK ride pre HIM... if so I'll post it here and gauge interest.

Good luck finding a decently flat area around Raleigh.  I just moved from RAL to Jacksonville, NC... Like the previous posters said, your issue will be WIND.

The wind around here is brutal.

The closest flat course I know of is the Battle of Buckhorn tri course.  It is fast and pretty flat. http://www.fsseries.com/index.php?action=event&event_id=45

Last year a group of us went down to White Lake to ride the course.  It's good to get used to flats if you're used to hills because you never get that break from pedaling at White Lake like you would on the downhills.  It's like riding a trainer for 56 miles.  And of course White Lake is always windy and the bike course has zero shade.  Riding the course beforehand is a great way to get your butt used to the rough road- ouch! 

As others have mentioned, some stretches on 64 is good practice for no shade and the wind factor.

Anyone interested in heading down there again this year to ride the course???