Where to go – family with toddlers in May

Hi. Back from this year’s vacation and thinking about next year. Interested in the Caribbean. We have young kids. We like hiking, wildlife, beaches and other general kid-friendly activities. We don’t really go for adrenaline stuff. We don’t really fish. We like interesting scenery. We have Marriott points so would probably stay at a resort or split between a resort and an air BnB. Happy to rent a car if needed. Would love some recommendations – I am not too familiar with the region. St Lucia looks nice but not really sure. Thanks!