There are many, many street...
There are many, many street food vendors, some much better than others. The specialties of Brittany are crepes, seafood, especially clams, scallops, schrimp and oysters, cider and mead (hydromel called Chouchen).
Watch out for overpriced...
Watch out for overpriced souvenirs!
Also: when buying film here carefully watch if it wasn't laying in the sun all day. Otherwise you will get bleached colours!
Last but not least tips: it's easy getting sunburnt here. Bring along suncream. Watch out when climbing on rocky spots. Watch out for the upcoming tide.