There are a lot of salt fields near Jiquilillo, Chinandega. That is pretty common near a lot of the long coastline in Nicaragua.
It’s a really undeveloped, long beachfront. It’s a nice beach and the people are really nice too. There are a couple of places for tourists there: one is Monty’s Jiquilillo Surf Camp. Looks pretty quaint. Here’s a link for his official pictures: http://montysbeachlodge.com/
I personally would go with Monty’s Juquilillo Surf Camp. It has a nice little restaurant/bar area and the accommodations are rustic but comfy. This old water tank, as a still standing relic from a past tidal wave, is just down the beach from Monty’s.