As an alternative to Margaritaville, I would check out Boardwalk Village. Less hassle than M-ville, but they have a DJ, a water trampoline, decent food/drink and a few shops to check out.

However, much like Margaritaville, I would probably get bored of Boardwalk Village after one day. That's when I think a beach bar crawl would be in order.

As an aside, I hung out at Cosmo's for the first time last week. Nice, big beach, but I was surprised that they charge $400J for admission and $150J for beach chairs. I would have thought that admission would be free for restaurant guests. Anyway, it's a great place to start a beach bar crawl as you can just head south and hit every bar on Long Bay. My wife and I did just that, but stopped at Kuyaba when I had to cross the street and hit the ABM at Time Square. On the other hand, you may not want to pay the entry fee at Cosmo's if your intent is just to grab a beer and start walking down the beach.