Isle of Wight - how hard can it be?

I'm doing a 100km ride this Saturday around the Isle of Wight with my local bike shop and would be interested to know how easy/hard the riding is over there!?
2011 Yeti ASR5 carbon: http://www.pinkbike.com/photo/5817307/
2012 Wilier Cento Uno:
http://www.pinkbike.com/photo/7134480/
Commute bike: http://www.pinkbike.com/photo/9065383/
2012 Wilier Cento Uno:
http://www.pinkbike.com/photo/7134480/
Commute bike: http://www.pinkbike.com/photo/9065383/
0
Posts
otherwise its good - lumpy and bumpy as someone said, so some little hills to attack
2012 Wilier Cento Uno:
http://www.pinkbike.com/photo/7134480/
Commute bike: http://www.pinkbike.com/photo/9065383/
Works out at around 115km, with a few nice drags.