Erica, Lower Hyde is near Shanklin,,look at this link: http://www.ukcampsite.com/southern-england/lower-hyde-holiday-park.htm
It is a very busy family park, good facilities, but can get very noisy too.
There is no such place as Bembridge Bay , there is Whitecliff Bay at Bembridge, or Nodes Point at Bembridge, but Nodes Point does NOT take tourers, so I assume you mean Whitecliff.
This is a huge site covering both sides of the road running between Sandown and Bembridge. One of the caravan fields is terraced and the pitches are good, the other field is gently sloping so blocks would probably be needed. The main reception, club and static homes are on the sea side of the road and it is a steep climb down to the private beach, however,,a short drive will take you to Sandown sea front where access is very easy, especially at Yaverland where there is a ramp to the beach, or if you go further along and on to the front access is level to the beach. Lots of eating places and pubs in the area, most with some kind of entertainment during the summer months. Sandown also is home to the Zoo, which has the largest collection of breeding Big Cats in the country, and the Dinosaur museum, as well as the usual seaside things,ice creams, crazy golf, etc etc