And if you are worried about what Toad thinks, you are in even deeper trouble.
Shorts and sandals are ok, probably a shirt with a collar. Don't be surprised if a dog or two wanders in during the service. As I remember, it was in English, and it wasn't the stodgy affair you may be used to. You'll have to check the schedule, but I believe it was either 9 or 10. The church is right in the center of town, on the beach, can't miss it.