All great advice here. I also take my phone in a plastic sandwich bag if there's a possibility of rain and use sunscreen. One more thing, be sure to have a map of the course with you and be sure to pay attention to what color arrow is being used for the 30 mile course. My first 60 mile group ride ended up being an 85 mile group ride because I followed the wrong arrows and turned right when I should've turned left. Trust me, you don't want to do that!
Most importantly, have fun.
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"We don't stop playing because we grow old; we grow old because we stop playing." George Bernard Shaw
Luna Eclipse/Selle Italia Lady
Surly Pacer/Terry Butterfly
Quintana Roo Cd01/Koobi Stratus
1981 Schwinn Le Tour Tourist
Jamis Coda Femme