It took about an hour and a half for the mechanic to show up - he said it was the starter, and that he'd get a new one. (Or maybe rebuild the old one - sometimes our Spanglish doesn't get the entire story.) He said he'd be back about 3 PM.
We talked it over - figuring things wuld run late, and who knows how long the work might take - we decided we should just spend one more night here in Puerto Viejo.
So we walked around town, had a nice lunch, came back to read and wait. Of course, the mechanic showed at about 3, and the car was ready by 4 PM. We could head out. But we've already paid, so we'll stay, and get an early start tomorrow.