My husband and I will be flying into Kauai 7/4 to celebrate our 5 year anniversary and to go on our babymoon (I'll be 3 months pregnant). We'll be in Kauai until the 9th, when we'll fly into Oahu to spend some time with relatives that live there for 4 days. We have another 5 days to either go back to Kauai or go to Maui for a few days and then back to Kauai. I've been to Oahu a bunch of times, but hubby has never been to Hawaii and he wants to explore the different islands. Is it worth taking on Maui or should we just enjoy the last 5 days in Kauai?

Spend the 5 days on Maui.

Lots of info including sites with free brochures for all islands:

http://www.fodors.com/forums/threads...1&tid=34812564

I would also recommend going to Maui. Each of the islands have different attractions - why not take advantage of your time there and see all that you can? "Hawaii for Dummies" really helped us focus on which islands we wanted to visit and what to do when there.
Have a fantastic time!

Since you're already breaking it up with the Oahu portion, I'd definitely vote for Maui - you'll have 4+ days on each island, which will give you a nice vacation, as well as enough time to get the flavor of each island. Have fun!

Definitely go to Maui! Each island has it's charms so it's great to visit different ones.

Definitely Maui. You've got a nice stretch of time and will have already had 5 days on Kauai. Since the trip is split up anyways in the middle, I'd add on Maui for sure.