Kidani with car or BLT without car
Kidani has fun pool for early swimmers. My kids are 5 & 7 and we went in March for a week staying at Kidani and the pool is perfect for kids. Your car will be parked under building in the SHADE!!! I suggest making lots of reservations for Sanaa downstairs for dinner, as it fills up & ONLY on-site dining option - you can always cancel if can't make ressie. We loved BOMA over at Jambo (we drove there), and counter service was great for breakfast at Pool-side Mara. The dark theme we liked until time to pack early morning, couldn't get enough light to see things & left a few items behind - couldn't find cell phone case, etc.
If don't want a car, then maybe stay BLT as can walk to Magic Kingdom, character breakfasts, & California Grill was fun for dinner.
AK was favorite park for my husband & my kids, and the Flame Tree BBQ place really great for lunch within the park. We spent 3 days at AK!!!!
A side note about meal plans if you need character breakfasts:
If you must have the dining plan, the deluxe plan I found better, as can have mid-morning character breakfast, and a quality signature dinner which we found best. The standard plan didn't work well for us and we paid OOP for meals towards the end, but ended up with tons of snack credits we never used. Think the Tables in Wonderland will work better for us next time actually so need to buy one annual pass for someone in our party so we can get the TIW discount card. The problem was that there are so few good counter service options, except for breakfast, and fried food type places - like Yorkshire Fish was yummy. Even the food court Sunshine Seasons we found not so good - total party of 7 with friends and all the food was a little below average. The WAVE at the Contemporary we found best deal and best quality for one credit meal for sit-down meal, though, similar to Coral Reef, but more eclectic & interesting menu. BOMA also really good.
With the standard meal plan, since didn't include any appetizers, or discounts on adult drinks, etc, we still ended up paying OOP over $1200 for food & drinks with standard meal plan for 2 adults & 2 kids. We would have done better with Deluxe Plan or TIW. So for a 4 year old, who may like a lot of character breakfasts maybe every other day, plus you may like a quality dinner somewhere, the deluxe plan works best. They should offer dining plan with 2 quality sit-down meals a day, but they don't - it's either 1 or 3, annoying.
Another tip: if stay AKV, don't drive to MK, unless you can get Diamond Parking, which we did once. But otherwise, it was a pain to park elsewhere - then must drive, take tram, then take ferry or monorail, fine in morning, PITA in the evening when kids tired. The bus was also much faster from AKV to the other parks too, like AK. Getting back on bus, with long lines was another story. We liked using the car mainly to drive over to Jambo, or to other dining options at other resorts.
Have a fun trip!