My husband and I just booked a Carnival Cruise from San Juan in May with stops in St Thomas, Barbados, St Lucia, St Kitts and St Maarten. I'd like to purchase excursions in 2-3 ports tops and do our own thing in the others. Any recommendations of which islands are easy to navigate on your own? Or what we should do at each spot? We love the local feel, are foodies and don't mind public transportation. Thanks in advance for any ideas!