Advice needed- st Lucia or somewhere else?

Hello! My husband and I had our honeymoon planned for this past September to Maui and Kauai but due to sudden medical concerns we had to cancel. We’re looking to start planning again so we can at least do something, but our budget and time off has changed. I’m looking for something decently close since we are going for about 5 nights. We’re located in the northeast. I’m thinking St Lucia but open to other ideas. I wanted something relaxing with some adventure. Hoping to stick to about $5k for flights and hotel/airbnb. Looking for ~February-April 2026. Thanks!