Enjoy your weekend!
PM me if you want a short route to do on Saturday to get your legs moving. I don't recommend trying to ride out on Tybee. There are some short out and back rides from downtown, and you could always go down to the Army air field and do some easy laps. I can send you a link to the usual saturday morning loop. Some of those roads are (I think) on the longer bikefest routes.

Might be good to pop into a shop to see if anyone is going to participate. There are a lot of tri people in the area, who you might be able to relate to well from your marathon days.

At least you're used to the heat and humidity, but be careful out there. At some of the recent training races, people have been having problems with dehydration and heat exhaustion.

Tell me how the Talmadge Bridge goes. I've never trained over it because I've been terrified of getting run over or getting flats at inopportune moments.