The kids will love it. Wait 'til they see all the fish!

The markets run most days on the waterfront on the main road through the town and they're worth a visit. Also, there is a glass bottom boat tour which leaves from the same place and goes around Iririki Island. You can jump in and feed the fish by hand. Great fun. I also recommend getting a car and driving around the island. Left drive cars, right side of the road, roads like goat tracks but it's awesome fun!