Leslie,
I competed in the three person team last year, and I am going to sign up again this year. Last year I did all 21 swims for our team as well as 6 bike laps and 2 run. I learned after about the third swim lap, that you want to wear shoes down to the waters edge, slip them off, swim, and then slip them back on. Each swim lap entails a 1/4 run as well. The ground is not condusive to barefoot running nless you have really tough feet. Last year they did lay down carpet remnants, but it wasn't enough for me, I wore Crocs and it worked out ok. Good luck, and see you there.
-Jeremy