When you are in Hawaii, you must definitely try the spam musubis on the island! A popular destination for people to visit is Musubi Cafe Iyasume which has a great selection of musubis and onigiris. If you are unfamiliar with what these are, musubi is a Japanese dish that has a slice of spam paired with a chunk of rice and wrapped with seaweed. For onigiris, it is a Japanese rice ball usually in the shape of a triangle with fillings such as tuna or salmon and wrapped with seaweed as well. These are both great to-go items that you can bring to hikes and the beach and enjoy as a snack. Musubi Iyasume is probably the most popular place to get these items and they are also very reasonable. They currently have a few locations all over the island but I love going to the one in downtown Waikiki! If you get a chance to visit the one next to Shoreline Hotel, that location has tempura musubi which is shrimp tempura and rice wrapped in a piece of seaweed. I haven't seen any other locations have this so this is one of my favorites to visit and grab to-go since it is an extremely tiny shop.
Musubi Iyasume has plenty of options to choose from even for those who are vegetarian. You can choose from their premade ones that are made fresh each day or hour like their spam musubi with bacon and avocado, egg and cheese, unagi, and more. For their onigiris, they have options like plum, seaweed, bonito, tuna mayo, etc. Depending on the location you go to, some will require you to place an order so they make it fresh in the back for you or you can just grab and go. An option is to also order online so you can skip the wait when you arrive. They also have other items on their menu like miso soup, bento boxes, udon noodles, and even poke bowls but definitely go for their musubi and onigiris. Each item only costs about $2 - $4 and they are such a tasty and easy treat to bring along. If you have never tried it before, I would highly recommend giving them a try and see what you think. I personally am obsessed with them and visit them at least once a week to satisfy my musubi cravings. This is also a great place for cheap eats since eating 2 - 4 of them is enough to fill you up for a quick meal!