Montessori is excellent as is Antilles.
There are also the parochial schools such as Sts. Peter and Paul,
All Saints and Lutheran School here in STT.
Private schools obviously more expensive than public schools but they also offer reduced tuitions if you qualify.
If you have grade school aged kids, Sibily School is an excellent choice for a public school. Not sure I would consider any public schools for high schoolers.
That said, I never went to public schools growing up here and went away to boarding school from my sophomore to senior years.