Where is Oahu? How much is the tour fare?

Oahu is the island where the city of Honolulu Lu Lu is located. There are historical sites, water sports, a lot of delicious food and shopping, which are worth visiting. It is a major tourist destination in the Hawaiian Islands. Last year, I traveled abroad to America. At that time, the cost of activities was very low. I feel good after attending. I don't know if there are any activities now, so let's know.