INAGUAS RESTAURANTS MORTON MAIN HOUSE serves a full breakfast that costs $4 to $6, and lunch, but not dinner. TOPPS AND COZY CORNER serve island fare -- cracked conch, for example -- at lunch ($5 to $7) and dinner ($7 to $10). All provide tasty meals but tend to keep irregular hours. THE LAST STOP Grace Burrows at The Last Stop, (242) 339-1740, will prepare special evening meals given adequate advance notice. Anyone visiting Inagua would be wise to bring along prepared food.