Finding Undisclosed Restaurants on the Adriatic Coast

Along the Adriatic coast there are some bizarre looking fishing piers called 'Trabocchi'. Some of these are apparently several hundred years old. San Vito Chietino, for example is mentioned in the Wikipedia as...

The town is home to the "La Costa dei Trabocchi". Trabocchi are giant wooden platforms built since 1400, in the middle of the sea. They can be seen from the town of Ortona to Fossacesia. For local fisherman this was one of the method to fish abundant catch for the residents.

Source: Wiki entry for San Vito Chietino

Check this photo...

Source: Google Maps: The overflow "classic location for fishing from the shore

I am informed that some of these 'traboccho' have been converted to combination fishing piers and restaurants, and eating a dish of "Luppa di Cozze" on one of these structures would be a fantastic culinary adventure.

Question: The problem is that which ones contain a restaurant appears to be word-of-mouth only. Is there a way you can tell from the road? Do you just walk out on the pier and ask to be seated? Or do they even seat foreigners? Is there a tipping convention? I am OK with language issues but am clueless as to local customs.

Also: I assume the restaurant is cash only. Any ballpark idea what a dish of fresh "Luppa di Cozze" might cost would be very helpful in avoiding a quick trip to the nearest cash point.

Any mussel producing location on the Adriatic coast between Vieste and Ancona will do.

Note: "Luppa di Cozze" = mussels overlaid with pepper slices and cooked in white wine in a large ceramic pot.

Note: From comments: there's more info here, along with great photos of the food I'm talking about.