Favorite thing: The Chapel was build in 1854. During the second world war this chapel was dynamited in august 1942 but was rebuild in that same month 8 years later. I personally find the new one much prettier that the old one (see photo’s)
The official website of the town of Etretat is www.etretat.net. There are versions in several languages including English. The site is full of interesting information and should help you to plan your trip.
However, I much prefer the unofficial site www.etretat.com. Unfortunately it has not been translated but if you can read French check it out. This site suggests that in order to get the best photos you should visit the Amont in the morning and the Aval in the afternoon. I'm going to take this advice and we'll see how my photos come out.
Back from Etretat and I think this is very good advice.