Best island for young kids

Feb/March next year we are looking to possibly vacation to the Caribbean for a week with my brother and his family. We’ve cruised to a few destinations, but never stayed on any of the islands. Looking for somewhere that has safe beaches for toddlers, as well as snorkeling that an 8 and 10yo can handle. There will be 10 of us traveling together. 5 adults (one hoping to be pregnant) and 5 kids ages 10, 8, 4.5, 4, and barely 2. I know « affordable » looks different for everyone, but not looking to go to the most expensive place out there! Willing to rent cars, but we want to be on or walkable to a beach or excellent pool. Doesn’t need to be all inclusive. Open to any suggestions!