I'd recommend a trip to Little Corn Island, but not that time of year. December and early January are usually very rainy. Don't forget that Little Corn has no airport; you fly to Big Corn from Managua and take a panga (small boat) to the smaller island. It takes around an hour and the trip would be no fun in the rain.

Yemaya is the nicest hotel there.

www.littlecornhotel.com

Other accommodation is mostly pretty basic