Welcome to the DIS boards!!!
Your question is one a lot of people have!! As already noted, you room may very well be ready when you get there!! So, when you arrive at your resort, get checked in. If your room is ready, head there, freshen up, drop your carryon bags, and head back to the bus stop area and go to a park. If your room isn't ready? Leave those carryon bags with Bell Services/Luggage Assistence. You will be asked if you want to leave a cell number to get a text when your room is ready. So, drop the bags and head to a park. When you get back to the resort, you go to Bell Services/Luggage Assistence and get your carryon bags. Be sure to tip the CMs about $1 per bag! Then head to your room, where your checked bags should be waiting for you.
Any other questions, feel free to ask away!!!