Mustang island/Port Aransas area is actually not bad. I prefer south padre, because the water is better and it’s a little more developed, but the Port A area has a great beach and is usually a little less expensive
It’s been a few years but irie’s seafood has been around a long time and it’s been consistent. I’m not an oyster person, but people love black diamond (across the causeway, but on the water). Port A pizza is actually pretty good. And coaches is good for breakfast. Corpus obviously will have a big variety too. There’s an Italian place in port A that people like, but I’ve never been to.
There are places that have been their forever like Doc’s, Virginia’s or snoopy’s pier. Some great views and good places to maybe grab a drink, but I think they live on reputation. Check with the locals as maybe they’ve improved.