I think that is a decent deal. You're getting 15-20% off rack rates there and it may be the best discount available to you.
If you are a passholder or FL resident, you might be able to get a deeper discount, but if you're not either one of those 15-20% is a decent deal.
I would hop on it while it's available, because they only allot a certain number of rooms to be booked with that pricing. Once they are gone, you will only be able to book the room at rack rate.
For further savings, you can buy your tickets from an
authorized ticket dealer like
Undercovertourist.com. It's not a huge savings, but if you're going to be buying 6 day park hoppers for several people, you could be looking at around $100 bucks and that's nothing to laugh about.
I haven't stayed in CL before so I can't if it's completely worth it. My personal feeling is that the only real perk is the food and beverage offerings in the lounge, and that's not worth the price difference for me. It may be to you though.
The Sunrise Safari is only available to AKL CL guests, but the Wanyama (Sunset) Safari is available to any AKL guest.
Yes, you can use both pools at AKL when staying there. The Kidani Village Pool is about a 12 minute walk from the Jambo House lobby. Obviously, the Jambo House pool will be much closer since you'd be staying in that building. I haven't been to the Kidani Pool, but I hear it has a better wet play area for children.
I'd recommend checking out the All Ears.net FAQ page on AKL. Look at the photos and check out the maps so you understand the layout:
http://allears.net/acc/faq_akl.htm