Four kilometres from the causeway (turn right at the junction) is this large American-owned grassy compound with easy lake access, loads of birds in the gardens, campsites under the acacia trees and a couple of very comfortable and colourful stone bandas. There's also a cool bar-restaurant (dinner KSh850).
The staff can sort out good guides and arrange boat hire. The owner is involved in all manner of ecoprojects on the island.