Things to visit in West Sussex, Great Britain [closed]

I'm planning a trip to Great Britain for entertainment purposes, and as a side effect I can visit West Sussex region at the end of May. I'm interested in historic monuments and landscapes.

What are the most interesting things to see in that area, beside the sea?

I saw some medieval castles, but they seem too far from Wiston, the place where I have accommodation.

[Edit] I plan to travel with a rented car but I only have few hours until afternoon, when some events I participate are scheduled.

I searched for places to visit in that region and beside sea (that can be reached quickly from Winston and fulfill a personal wish):

• Buchan Country Park (40km - that is 2 hours required to visit a park, not sure if is worth the time).

• Arundel Castle (22 km).

• Bodiam Castle (88 km, a bit too far)

I haven't been to England before I do not know what to expect, what's interesting and worth visiting in countryside. Usually I ask friends that traveled before, but this time it seems that I am the pioneer.

I plan to stay in London after, for a few days, but some friends have already been there, so the list of things to visit/do is easier to make.