Hi Enzo,
I live on the IOM, and you can park more or less anywhere you wish. As was said before, Ramsey has a nice free camping area, overlooking the sea, beside a boating lake, cafe, park,wc, gardens, also close to the new swimming pool, with showers if thats all you require, and 2 mins walk to Ramsey town and harbour. Also there is the Sulby Claddaghs another free campground, popular places are the Point of Ayre, Smeale, Ballaugh beach, Kirk Michael beach, in fact most of the beaches, etc, etc, There are however, campsites in Douglas(Nobles park), Peel, Kirk Michael(Glen Wyllin), Laxey(very small), Hillberry near Douglas, Glen Lough(Douglas to Peel road). l have never known anyone being moved on for camping anywhere on the Island. l have many friends with MH, and they often go to a different town for a night and park up somewhere suitable for free. Come along, and if the weather is kind, you will enjoy yourselves, and our hospitality. TT is around the first 2 weeks in June, if you don,t like crowds and bikes, avoid.
Craig.