Anaheim is part of the greater LA area, where I used to live, and a couple cuisine highlights I quite liked:
- "street style" tacos - this kind of Mexican taco is a very simple: a corn tortilla with meat, onions and cilantro. no cheese, tomatoes or lettuce, or at most a limited amount of cheese. You can find these at various places in LA. If you rarely come to the southwest USA, this might be a chance to try this taco, which is the progenitor of many styles of taco that have spread throughout the world. spicy sauce on the side here usually.
- Korean Barbeque - KBBQ is a big hit in California, and has its origins in LA, when Korean immigrants combined their eastern ingredients and recipes with western cuts of meat and beef availability. There's a particular style of short rib, "LA Galbi" that is famous and originated here, known for its rich, sweet soy sauce flavor. You will find many KBBQ places in Anaheim, some of which are all you can eat style, and some are not. Some of these places have you sit directly at a grill, and they put the meat on the grill for you - you may be expected to turn it over with tongs and serve yourself! spicy sauce and side dishes are on the side usually
I lived in another part of LA, but these two cuisines were ones I found everywhere I went in LA and I'm sure Anaheim has both of them, and they were unique and approachable experiences for me I liked a lot.
The one time I was down in the Anaheim region, I went to Huntington Beach, which isn't too far away. It's a good tourist attraction, even if you don't go in the water. There's a pier, a couple of museums, and some very interesting people-watching to do on the beach and downtown Huntington Beach