.....i have a visa that says stati schengen from 3rd april 2010 to 29th april .?

i have a schengen visa valid from 2nd april to 29th april.. and says Stati schengen... but the duration of days states that its 5 days.... does that mean i can only visit one country, my main destinations for 5 days or i can travel to the countries till my visa expires and in each country duration should not be more than 5 days.. i am a bit confused coz i have all the bookings done for other schengen countries...