You could also give most of it away to a favorite charity, keeping however much you feel comfortable in owning.

There's a really interesting documentary called "Born Rich", which was made by one of the heirs to the Johnson & Johnson fortune, where he interviewed a lot of his friends who were all also born in to very wealthy families. They all had different ways of dealing with their circumstances, and I remember one of them did reject his family's fortune and tried to live an "ordinary" life.