One of the most stunning cliff-side views you can get near Tokyo, Jogashima Park is a beautiful, wide, open park with observatories that overlook the cliff-laden coastline. At the end of the park, there’s also a large lighthouse, although entry inside is not permitted.
If you've bought some snacks, this park is a great place to sit down and have a picnic on the park benches and tables available. It’s also relaxing to stand atop the observatory and just watch the waves crash against the cliffs, feeling the wind against your hair.