Felixstowe has a nice beach and sense of townliness with its pier and municipal gardens, but there are some interesting features just to the south by the port. Landguard Fort dates to 1540 and has quite a lot to explore, and near that the View Point Cafe attracts locals and visitors who like to watch the container ships calling at the port.
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Felixstowe's quite interesting, got two extremes; the really busy docks at one end and then there's Old Felixstowe at the other, around the golf course where you can go crabbing, sailing, walking, or wheel your bike onto a little one man ferry and catch a ride across to Bawdsey, all very quaint and quiet, old fashioned, pine woods and stuff. S'nice.