Hi all. We did both Dine with Shamu and the Picnic when we visited in April (food overload but we are from Australia so there are no opportunities to see killer whales here!)
We enjoyed the picnic, the food was great and as stated above you have reserved seats for the show. I especially liked the fact that we didn't have to line up for food and then carry it into the stadium. We just sat in our reserved seats and the food (which was pre ordered) was brought to us. The photo above is deceptive as it is zoomed in. You are in the stadium with everyone else, the seats are the first couple of rows outside the splash zone ( which is about 15 rows, so you are not really close). They are good seats but it's not an intimate experience.
Dine with Shamu is a very different experience. We loved it, we booked as soon as seats became available and got a great table. You have a buffet lunch at tables that are right beside one of the training tanks. When Shamu slid onto the stage area he was just a little over 3 feet away from us! There is a rope like fence between you and the tank. It is not a show really, the trainers tell you and the other diners about the whales and show you some of their behaviors for approx. 30 minutes. The food is good and you get as much food and drink as you like including dessert, but if you are like us we only ate a quick meal with some strawberries for dessert, because we didn't want to miss a minute of these amazing creatures. Expensive? yes, but an unforgettable experience for me and my children. Would do it again in a heart beat...
Enjoy your day at Seaworld