There are not too many places in the United States that are as nice as Hawaii in general. My absolute favorite place to go is the North Shore on the island of Oahu.
I can reach there by bus from my $35-a-night Honolulu Airbnb which I have stayed at a few times for $2.50. I stay in the single occupancy, but she has seven properties that vary in size and price. I can help you find the perfect pad for cheap!
I normally take my Tommy Bahama beach chair you can grab at the Costco down the street. I pack a few seltzers and grab my traveling hammock. There are several beaches to choose from but close to Foodland where you can grab some fresh poke bowl for under $10.
Talk about a perfect day in Hawaii for under $50 with accommodations!