If your ADR at Tusker is at 8:30, you may not be done until 10:00 a.m. It depends on whether you have a wait to be seated and where the characters are in their rotation when you are seated. They could be about to reach your table, or it could be quite a while before they all get to you. We have had it both ways. I think the quickest we have been out of Tusker house from our ADR time, is an hour, and often it is more like an hour and a half. It is not unusual to have to wait 10 to 20 minutes after your ADR time for a table at Tusker in the mornings. Sometimes you get lucky and are seated pretty quickly. So say you get out at 10:00, then you might have a 20 minute wait for Safari. Then Safari is a 20 minute ride. You are at 10:40 right there, which does not count walking back to the front of the park, waiting for the bus, the approximate 15 minute bus ride (around 6 or 7 miles), getting through bag check and the gates at EPCOT and walking to your FP+ ride. I think there is a good chance you would miss it. If you were out of Tusker by 9:30 and safari was still walk on or a 10 minute wait- you could be done and our your way out of the park around 10:00 and then you would have a better chance, but it would still be tight. I would push the FP+ back at least an hour. How old is your DS? My DD(8) has never been a big AK fan until last year when they added the Wilderness Explorer mission book- she had a lot of fun with that, and for the first time stayed well into the afternoon without complaint.