If your flight is at 6:30-ish, you will be getting a pickup time of between 3:15 and 3:45. It's usually 3 hrs prior to departure, give or take 15 mins either way. You need to be out, waiting at the DME bus stop, no less than 15 mins prior to your stated pickup time.
If you are flying out on a 'participating airline' you can check you bags and get your boarding pass in the morning, before you leave your resort for the day!!! It's a wonderful service. If you aren't flying on one of the participating airlines, and will be taking your bags with you? Just store them with Luggage Assistence. THen, be back there, receipts in hand, no later than 2:45. That gives you plenty of time to get your bags and use the restrooms one last time before heading to the DME bus stop. I usually try to be back at the resort an hour before my stated pick up time.