Depends on when we arrive.
Some trips, we get going at 3am and arrive around noon (driving from NC). We usually check in to our resort, relax, eat some lunch, take a swim, and explore the resort. We head to either Boardwalk or DTD for dinner and just hanging out. Usually we include a grocery stop in there for things like milk and breakfast stuff, then an early bedtime so we are ready to go first thing in the morning.
Other trips, like the one coming up in November, we leave after school and arrive late, usually around midnight. We just check in, drag the luggage to the rooms, and collapse in bed. The next morning is really our "first day", and we hit the ground running, arriving at our first park for rope drop.