not a B & B - but try the 2 seafront hotels in Sandown, a bit worn, but one has huge garage.
By the way - the Annual Gert Gallybagger rally is on over this w/end at Atherfield point, so there will be a fair few bikes going on the ferries from now onwards(we've had to give it a miss
cos of cadwell)
You'll find anywhere on the south of the island pretty well booked up by now.
also, be warned - there are a VERY strong contingent of Hants finest motorcycle boys in blue who go over to the island on the Sunday, as its the 'round Wight' cycle race.
The world & its granny/kids/aunties & uncles are frantically peddalling all along the coastal roads - take lots of care on the old military road - not a good time to see what your speeds are like
Plod dont take kindly to having their bank hol wiped out by policing this - and they have never been tolerant of bikers in the years we have gone over for the w/end (ask AK - it cost him lots 2 years ago!)
C