I love the south coast and always look at Belmont and Bluefields longingly - one day I'll do more than just drive through, lol.
On our first motorcycle trip of the season we rode out to get shrimp at Auntie's and UJ's but made a stop in Cave (just north of Bluefields) at a little place called Casa Mariner. It looks adorable:
http://wstcountywstend.wordpress.com/2012/04/25/back-on-the-back-of-the-bike/
On our LAST ride of the season we stopped off at Bluefields beach for a while. The northern part of the beach is where we stopped - there's a little restaurant there and that part of the beach is all rock. Pretty, but not a place to lay a blanket, lol. The southern part of the beach is sandy but the cop shop is RIGHT there.
Its a beautiful area - one day I'll spend more time...but have driven through many times.