I have lived in Boca del Rio for the past 5 winters and, since Mathieu's Deli moved to Placencia and ABC closed, I can't think of a single place in our neighborhood that serves cappuccino at any time of day. Sorry.
Newfoundlanders are the only people in heaven who want to go home.
Maybe the Chocolate store on Front St. which is about a 15 min. walk. Possibly Rain up at Grand Caribe (1 1/2 miles north) but those are the only 2 possibilities I can think of on the Island. There is an idea for some Entrepreneur. How about Marbucks near the old Palapa Bar? (1 mile North)
These are just some guesses on my part. Good Luck.