You can check out single gender schools, also. For guys, you may want to learn about Salisbury School, Avon, Trinity Pawling School , and Woodberry Forest (nice golf course) - sure there are more, but those come to mind.
In addition to the resource mentioned above, there is a virtual event planned on Dec 9th by great boarding schools -dot-org. You can learn more about several schools on their website. I believe the virtual event is focused on applications. Bon Chance!