I would regard Daisy's Walk in Rendlesham Forest one of the best walks in East Suffolk at any time of the year, see here
http://www.forestry.gov.uk/Website/ourwoods.nsf/LUWebDocsByKey/EnglandEastAngliaNoForestRendleshamWoodButleyCornerCarParkandPicnicSiteDaisysWalk
The Riverside Walk at Melton [East Suffolk railway line] as seen yesterday on a very hot April day, this takes you via the length of the river wall to the National Trust Kyson Point on a circular route passing water meadows and through woodland too
The Suffolk Sandlings Walk in pictures from Southwold to Ipswich
http://suffolk.activeboard.com/forum.spark?aBID=119775&topicID=42366784&p=3
The 51 mile walk from Landguard Point to Corton Cliffs which has taken me a little longer than 12 years to complete mainly on the beach!
http://suffolk.activeboard.com/forum.spark?aBID=119775&topicID=39089413&p=3