The Regional park has been put together like a jigsaw puzzle of different areas which could offer a really superb choice of ecosystems, such as coastal dunes, wet woods and prairies, the mouth of two large rivers (arno and Serchio) and an extremely interesting lake surrounded by large expanses of peat moss. Hundreds of species of plants and animals can (or more appropriately, could) be seen. Unfortunately, some of the areas are extremely degraded, and have been included in the park in the hope of helping their preservation. Others areas are simply too much close to Pisa and Viareggio and to large industrial areas to be pretty to look at. The main area used to be a residence for the King of Italy, then for the President of the Italian Republic, and nowadays it houses a large and very popular horse racing venue which makes it almost impossible to visit in racing days. The rest of the woodland is kept as an integral reserve and cannot be visited in working days, which is a shame. So all in all, if you are not a local, or if you only have few hours to spare for a visit, just stay away, because chances are you will be kept out from the places you want to see.