cloudpear,
Actually you can visit the school without talking to the principal. You just call the school and ask if it's OK for you to come and tour the school.
But you most likely have to talk to the principal about early entrant (before 5). But since your DS already reading, writing and problem solving Math already and I would keep a year at home and skip K.
Make sure the school has good gifted program. If you do not have friends, ask your realtor about your dilemma and ask if he/she knows the principals or teachers or parents (with gifted kids) in those schools. Some realtors are well connected.
When your DS starts the school, volunteer at school especially the prinicpal's pet project. He/she will know you and will go along with your request as long as reasonable. (my experience anyway :-)
