I live on the Mississippi Gulf Coast. The water is brown because of the Mississippi river and the barrier islands skirting the coast. The islands hold the silt in and do not allow it to be flushed out into the wider gulf. This creates a wonderful nesting ground for our seafood and why we are known for Gulf fresh seafood. The water is not polluted, but brown because of the sediment.
Most locals either boat to the barrier islands for the blue water or go over to Dauphin islands in Alabama or Destin Florida. There is a daily passenger boat to Ship Island from Gulfport Miss where the water is beautiful and dolphins often swim alongside of the boat.
There are several attractions on the coast. Infinity science center (museum on space exploration), Gulf islands waterpark, minigolf, local shops especially in Pass Christian, Bay St. Louis and Ocean Springs. Wonderful local restaurants all across the coast. Ohr Okeefe and Walter Anderson Art museums and Beauvoir home and Biloxi visitor's center (free and wonderful) for history. Can't forget the Lynn Meadows Children's museum in Gulfport, a class act with amazing treehouses that are handicapped accessible! Also the Biloxi and Bay St. Louis bridges have walking paths with beautiful views over the Gulf A nice free activity my family enjoys.
The Mississippi Gulf Coast is a laid back destination and it's attractions are a bit spread out in different communities but there's plenty to do for a long weekend.
Most hotels on the beach, Highway 90, are across the road except for casinos. But there are many lights allowing pedestrians to easily cross the highway.