My son was just in your predicament and I have a teenage daughter going to Fernandina High School right now. I can't comment on Yulee High School's AP classes, but I do know both schools offer dual enrollments to our local community college. If you start your dual enrollment those classes will count towards your college GPA. My son recently got his A.A. through FSCJ, Florida State College of Jacksonville, and is now transferring to FSU this January. If you have any other questions or thoughts give me a call at 904-753-2970 or email me at email@example.com
P.S. We do have wonderful weather and beaches here as well.