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If you may want to set up a Dressage arena inside your regular arena, that requires more length. A small dressage arena is 20X40 meters (or about 66 feet by 132 feet), a large dressage arena is 20X60 meters. A standard size competition arena is about 100'X200' and is large enough for full jump courses and other uses. Also consider the fence material.
Suppose you were to build a bocce court that had a playing surface of approximately 10 x 60 feet. Here's how you'd estimate your materials. First, to conserve lumber and the amount of cutting you'd do for the border material, reduce the actual playing surface area to 9 feet 5 inches wide by 60 feet long.