ZzzKing
Contributor
EvaL:I haven't done the Flower Gardens, but it may be too deep (>100 ft or more) for a newer diver and you might not have much flexibility on your dive profiles (all/most dive sites are deep). Also, weather conditions can be very erratic in the gulf - one moment it's sunny and calm and half hour later stormy and turbulent.
Good luck and dive safely.
The folks I know who have dove there say the maximum depth w/o using a shovel is about 100' with the average being in the 70'-80' range. Ideal for Nitrox if you have the certification. They also confirm the comment about the weather.