Getting Ready to Run a 5K

This 4th of July I'll be running my first 5K.  Yeah, I know.  Big deal.  Probably some of you out there have run marathons (like my own twin brother, Mark, sister-in-law, Traci, and brother-in-law, Darrel).  But I thought it wise not to try and bite off more than I could chew.  So, I'm getting geared up for the Buffalo Center (wife's hometown in Iowa) Bison Firecracker 5K!  My only real goal is to finish as I haven't been able to run as much lately with it being 95 degrees and crazy humidity! Any advice?  Tips? 

BTW ... Both Darrel and Traci are running in this thing ... they are experienced runners, and I'm expecting Darrel to take home the crown!