SunTracker,
How long you been diving?
I have over 1500 dives. Am a former certified commercial saturation diver and still occasionally recreationally dive. Used to cave dive like mad when I lived in Florida. Bit of advice, if you were going to Truk Lagoon, or the Galapagos Islands, I'd say, GO! you are talking about diving a freshwater lake... they are fun when the ocean is not available, but, let it go, the lake will always be there.
Make your friend happy and go to his wedding.