The American Canadian Caribbean Line offers a variety of interesting trips to places larger cruise ships often can’t negotiate. The atmosphere is friendly and low-key, the accommodations comfortable but modest. Their three ships have retractable bow ramps that allow for landings directly onto the beach. These performances depend on just the right conditions of weather and tide. Both were perfect at Sanibel Island, where we strode to shore through thigh-high wavelets to the astonishment of a throng of onlookers, sunbathers and fishermen diverted for the moment from their purposes.