I don't know how the AP compares with the cost of a 10 day ticket. If the AP is less go with that and the problem is solved. If it is more expensive then just stay with the 10 for now, you can buy the 1 day when you need it. Many people find, like myself, that even though I love WDW, I tire of the place after a few days. I wouldn't even buy a 10 day but if you are going to ride the magic bus in and have limited flexibility there are still a lot of other things to do if people are getting fatigued at the sameness day after day. I always found that adding Park Hopper is a good way to help make the trip more stimulating and filled with variety. Also takes a lot of pressure off ADR's in just one park per day. Those are just a few suggestions, it is, of course, up to you what route you take. I'm sure it will be a great time anyway.