Manukan Island is beautiful and very worth a day trip. The snorkeling was some of the best I've ever seen. But don't bother spending the night on the island. The only accomodations are run by Sutera Sanctuary Lodges. They are incredibly overpriced and the bathrooms are disgusting--at least they were in the Hilltop Lodge where we stayed. The toilet never flushed properly, we were without water on two occasions, the staff was inflexible in the booking process, and we were awakened at 7:30 a.m. to the loud noise of a water pump right outside our bedroom window one morning. Don't make the same mistake we did. Go there for the day and spend the night at the Seri Borneo Hotel in Kota Kinabalu.