http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=1984470
Some more info about Walcheren-Zeeland in this previous thread, though another query.
I should indeed (see #5) take the Oosterscheldedam, unique phenomenon in the world labeled as storm surge barrier (SBB) .
You'll come on the Schouwen - Duiveland island.
You can ride the LF1 (part of the North Sea Cycle Route) from Middelburg (LF1 = long distance cycle route), direction Veere and continue to the SSB.
In Burgh-Haamstede you leave the well designated LF1, and go right to Zierikzee.
Then continue on the 7 km long Zeeland bridge, a gorgeous part (when there's no front wind...) to island Noord-Beveland.
Then direction Goes, riding back to M. or in Goes: return by train.
First it's good to know if your skills will make this possible. Because you should involve a short stay/break in Veere and Zierikzee.
Windmills in Middelburg, Veere, and some ten more.
For an 'oldfashined' dyke, turn to the right immediately after arriving on Schouwen-Duiveland from the storm surge barrier.along the coast to Serooskerke (and then to Zierikzee
When?
NB. Indeed go to the VVV, for a map and more info (Tourist Board): [http://www.vvv|zeeland.nl/en/]