12 hours in FLL, which beach should I go to?

I will be flying into FLL for a 12 hour layover and want to go to the beach to swim and lay out. Suggestions for which area to go to that would be quickest or cheapest to get to? I was thinking either near Las Olas or go south to Dania beach. Not sure if there are buses from the airport but I’m also willing to Uber / walk

I won’t go out to eat so I’m not worried about restaurants but I will be alone and don’t know the area or if one seems more dicey, etc.