Spring Bay is your best bet if the north swell is up as the rocks do provide some protection. With that being said, it can still be rough. Savannah Bay, Nail Bay, Long Bay are all also unfortunately going to be rough with a north swell.

You could rent a dinghy from Blue Rush Watersports at Leverick Bay and take it over to one of the beaches on Prickly Pear. Those are still protected in a swell, especially Sandbox.

You could also catch the BEYC ferry from Gun Creek and head over to enjoy their beach.

As for rainy day unfortunately not a ton. Catch the Gun Creek ferry over and play pool, shop and enjoy the spa at Saba Rock. Or board and card games at Sugarcane come to mind.