To be honest you should consider revamping the whole moderation system while you're at it. Taking care of a single sub-board doesn't give you much to do.
What I'd suggest is splitting the entire forum among 3-4 moderator groups and then lump interested people under them with the ability to moderate all the boards that belong to that group(so you'd have, say, a group that moderates all the island boards and general discussion). You'd need less people involved, though they might need to have a bit more dedication to the job(not a bad thing necessarily).
