If you're looking for a coastal school with great science programs, look no further than UNC Wilmington. One of the top marine bio schools in the nation, strong in the sciences all around as well. It's not a private school, but it is almost four times bigger than your current school. Incredibly laid-back and chill vibe on campus, with some of the friendliest people around. Great D1 sports also.
Also look into College of Charleston, very similar to UNCW.