We've always done a park on our first day. On our first trip with kids, we planned to go to DHS, primarily to catch the Playhouse Disney show first thing. Then the transponder on our plane wasn't working, and we pulled into MCO two and a half hours later than we thought. We went from a 10 a.m. arrival to a 12:30 p.m. arrival, and by the time we got to the hotel and checked in, had lunch, and got to the park, the last show for the day had already started. We ended up at Downtown Disney instead, and it was a wonderful, relaxing evening. We planned a trip to the parks again on our last (large group family) trip because it was a Sunday during Star Wars Weekends. My DH wasn't going to miss that! I was all for just swimming and shopping our first day this trip (we'll have an almost-five-month-old this time!), but my DH found out that it only cost about $8 each to add park tickets for that day because of the amount of time we're already staying. So we went ahead and added it on, and we plan on hitting one or two things in the MK before our 5:15 ADR at Chef Mickey's - the perfect place for dinner our first night, in our opinion. With the ticket price being that cheap, I figure that even if we end up only hitting one or two rides, it'll be worth it for a glimpse of the castle on our first day!