I have lived/dived/worked on Big & Little Corn Islands. Go directly to Little Corn island to dive/eat/stay. Big Corn's only attraction is it has the only ATM. I managed the only "dive shop" on B/C & would NOT suggest it to anyone,period. L/C has (2) D/S and both I recommend. Also L/C is beautiful,quiet,no cars,good food,and no crime. At the A/P,take taxis to the ferry,catch the wild boat ride across to L/C. Remember Capt.Flaco's motto,"no one arrives dry". If I was going back I would stay at the Sunshine Hotel and dive with who ever made me the best deal. Clint @ DLC or Adam @ Dolphin. Be sure the go/dive 'Blowing Rock' the best site in Nicaragua. Walk around & eat at all the small places on both sides of the island. Do not get locked in one place;stay at one or two. Maybe start at Lobster Inn one night then look around. If you need more detailed info, PM me.
"living life without a hard bottom"
KT