Not so much in Laughlin but just south of the Avi are some beaches that are hot spots for the locals.

lazy harrys is a cool cove i personally like...sems like no one really talks about it, but i dig it

I like to launch from there.  Unless they dredged that thing it usually has weeds growing like crazy.

i cant really explain it except its up river from avi and on the arizona side! its a cove you pull intp and in the summers its full! pretty cool bar

Its at the veterans memorial park.  Find that and pull into the cove inlet to the north and you will run right into it. 

is there diving rocks when you pull in?  I think this maybe the same place i usually go to.  There is a beach in the back?

It sounds like your talking about Lake Mohave (Gasoline Alley) and everyone else is talking about the river area in Bullhead City(Lazy Harrys).  There's no sandbars on the Lake that I know of but there is a couple sandbars on the river, one is just up river from Lazy Harrys and another is just up from the Big Bend State Rec Area.  I don't really see a lot of people hang out there though.