Bob - what a great idea -- hitch a ride on a boat to a church on an island!
And, Yankee 1 -- when cruising, figure where you will likely be on a Sunday morning (and, if weather might be a factor, where you will likely be on that Saturday morning, google search the catholic church in town and the time for mass, see how long a walk it might be from the marina in town to church, and with good weather enjoy a nice stroll.
You will likely meet folks in church and they could be interested in chatting with a cruising couple (we have been asked to join for lunch by friendly church folk). If the church is too distant, see if the town before, along your route, has a better walk. OR -- on the web, we have communicated with the pastor or a church contact listed, and asked if someone would offer us a ride to and from the service. Sure have met some great folks this way.
Now -- to Pickleball -- hmm --
http://www.usapa.org/whatis_pball/ might be a help, otherwise we'd better see if some other pickle ball players in the pub can respond to your question -- we don't know.
But - back to your wife's question about church. We have found finding and attending a Sunday service, while cruising, has been one of the delights of cruising. Have met such good people and shared such good times -- sometimes, folks have 'adopted' us -- showing us their town, near-by sights or historical places, and sharing evening discussions, often with neighbors included, of their lives. We've had great evenings hosting those folks on the boat and playing UNO aboard with their kids. And sometimes taking them out for an afternoon cruise of their harbor or river.