St Michael's Mount is a little island about 500 yards away from the town of Marazion, it is seperated by a granite causeway that is walkable when the tide is out, but a boat has to be used when the tide is in.
It looks like an exact replica of, 'Mont st Michel,' in France. This island and it's buildings were once a Benedictine priory and castle, from then on it was owned by the St Aubyn family for 300 years. At one time it was owned by two St Aubyn sisters and was then left to the National Trust upon their deaths.
St Michaels Mount is one of the most visited National Trust properties in Britain, and open to visitors Mon- Fri during the season
There are 100's of good walks in the area, but I recommend walking along the coast from St Michaels Mount heading east towards Prussia Cove.
It is a great walk and the views are stunning - we even saw a seal playing in the surf.
Even on a grey and windy day it is lovely.
Get the ferry across if it is high tide, or walk over on the causeway if it is low tide. The island is home to a fantastic medieval castle and a lovely church.
The castle is packed with history, and every room is full of interest. Lots of paintings, preserved living rooms, an armoury, and great views.
The ferry is very cheap and is good fun. It only takes 5 minutes.