JMHO....
If you don't have your own rental car/car, and want to do a lot of park days, then stay at BLTs. We love AKLV but the transportation using buses can be a real hassle as the buses come so few and in between and when they are full, you end up waiting a long time for another one. AKLV is far out from most of the parks except AK. Saying that, I have only traveled without a car twice (once at AKV & the second time ASMu) both with young kids so maybe that made the waits longer.. LOL.
BLT has the monorail and buses too... but you can also walk over to MK's Transportation area for bus usage there as they are more frequent than resort wait times.
We are staying at AKLV pre-cruise but are NOT going to any parks in May.
Enjoy!