I've paddled a tandem in Puerto Rico and it was fine; type in kayak review and get to paddlenet. Almost everything is reviewed non comercially and you may find what you want used. Initial stability is important given where you are planing to use the boat; this means the tendancy to stay flat on the water, a nice thing when casting and fighting a fish. I personally would go for a one piece boat as I don't trust jointed things that are supposed to keep me above the water. The back braces are a must unless you want a great abdominal workout. Think about how windy your area is and how much boat sticks up out of water. There is a fellow posting pictures of an inflatable than you might consider; I haven't been in one since 1972 so what do I know, but, he speaks highly of the boat. It's in one of the earlier threads about kayaks.

Good luck
Scott