If you want some good walks,  get Toni Sepeda and Donna Leon's Book   "Brunetti's Walks".   Gives   detailed Maps  and REAL names of places to visit  and eat in  (as in the novels about Commisario Brunetti).  Donna  Leon  has lived in Venice for 30 years and knows  all the good places!! which she includes in her stories!!   may be biased,  but   love Venice!! and  her books!