Sandpiper has been closed for quite some time now. Used to be a great place to spot, when arrivals would change to eastbound at or around midnight. With the A/C low across the water, the landing lights shine down on the waves, and you could see fish darting around. It was pretty cool.
And it was one heck of a make out spot ,too
Now days, you'll have to walk down to the beach.
Imperial Hill of course is a classic spot, with benches and even a spotting glass to use( I think it's still there)
From that spot you get almost an entire view of the south complex, and the western portion of the aiport.
Rob