As for thrills, IOA can't be beat in Orlando. The coasters, theming and design are all top notch. It is a must-see.
As for Animal Kingdom, i have been there many times now, but I must say I was disappointed on my first visit. The reason being, it is a very SUBTLE park, with a slower pace and more hidden treasures than most typical theme parks, Disney or otherwise. On my second, third and subsequent visits I began to explore & discover the park, and to really appreciate the thought behind it.
The Safari is amazing, the closest you can get to the feel of Africa, but go early morning or late afternoon to see the most animals (and a lot of them come right to the jeep). The Dinosaur (formerly Countdown to Extinction) ride uses the same technology as Disneyland's Indiana Jones attraction, but as a Dinosaur filled high speed Dark Ride. It' great fun! The Kali River Rapids River Raft Ride is not as long as other raft rides in Florida, but it has some unique elements, and the creativity of the queue line is humorous and beautiful.
In addition, the live shows at Animal Kingdom are the BEST stage shows of any Disney park, with "Festival of the Lion King" and "Tarzan Rocks!" told in a highly theatrical non-lineal form of performance that shatters the old Disney tell-the-whole-movie-in-25-minutes standard. I've used my passes just to see these shows again.
Finally, it is the most beautiful of the Disney parks, once you realize that everything was designed and created from Florida marshland. Even the initial walk-in is carefully designed to submerge you in the feeling of a lush jungle setting before letting you eye the park's centerpiece, the Tree of Life. Additionally, walk-through areas like the Asia section use exceptional theming, lighting, decor and even scent machines to create the real feel of a bustling marketplace.
I am a rollercoaster fanatic. I love thrills and Animal Kingdom doesn't have nearly as many thrill 椀搀攀猀 愀猀 漀琀栀攀爀 䘀氀漀爀椀搀愀 瀀愀爀欀猀⸀ 䈀甀琀 琀栀愀琀 猀愀椀搀Ⰰ 䤀 眀漀甀氀搀 栀椀最栀氀礀 爀攀挀漀洀洀攀渀搀 椀琀 琀漀 愀渀礀漀渀攀 眀栀漀 氀椀欀攀猀 琀漀 氀攀椀猀甀爀攀氀礀 攀砀瀀氀漀爀攀 愀渀 攀渀瘀椀爀漀渀洀攀渀琀愀氀 瀀愀爀欀 琀栀愀琀 椀洀洀攀爀猀攀猀 礀漀甀 椀渀 愀 琀漀琀愀氀 攀砀瀀攀爀椀攀渀挀攀⸀ 㰀戀爀㸀 㰀戀爀㸀ⴀⴀⴀⴀⴀⴀⴀⴀⴀⴀⴀⴀⴀ 㰀戀爀㸀∀夀漀甀 栀愀瘀攀 琀漀 猀挀愀氀攀 愀 氀漀琀 漀昀 氀椀昀琀 栀椀氀氀猀 琀漀 挀漀愀猀琀 攀愀猀椀氀礀⸀⸀⸀∀ 㰀戀爀㸀 㰀戀爀㸀䨀愀猀漀渀ഀഀഀ ⨀⨀⨀ 吀栀椀猀 瀀漀猀琀 眀愀猀 攀搀椀琀攀搀 戀礀 䘀氀漀爀椀搀愀䘀氀礀攀爀 漀渀 ⼀㈀㔀⼀㈀ ⸀ ⨀⨀⨀