VIEQUES, Puerto Rico - Since the Navy stopped its bombing exercises on this island five years ago, more tourists are visiting and word is out about Vieques's spectacular beaches. Several new restaurants, most of them pricey and requiring reservations, have opened to meet the demand. If you are looking to discover a gem, avoid the places everyone is talking about, which is how we happened upon Topacio, a Caribbean seafood restaurant hidden behind the main square of Isabel Segunda and serving up tasty local fare at great prices.