Sea Isle City doesn't technically have a boardwalk, it has a "promenade". It's basically the same as a boardwalk, though. It's just paved instead of being... boards. There is a nice smattering of places to grab dinner, a quick smoothie, ice cream, etc. And there is a great little plaza with a gazebo near a bunch of shops and restaurants. There are tables outside and a little green park right nearby. It's a nice place to spend the evening after a day at the beach, and also a great place to get a breezy morning walk in. The park also sometimes has fun outdoor events like concerts, movies, and a little farmer's market once a week.