Should I plan games or no?

My son's 1st birthday is shortly approaching. We are having it on a Sunday at a park with lot of play things. I am wondering should I do games? I was thinking yes at first, then no, now I have no idea lol. There will be 4-5 under the age of 1, 2-3 that are around 2, at least 4 more that are over the age of 2. We will be having food and doing presents and I am making goodie bags. The party is 11-2, I figure have some food out, at about 11:30 make the hot dogs and hamburgers. Presents about 1, and cake and ice cream at like 1:45. There isn't a ton of room for games, since I know the kids will want to play at the park. Anyone else have their party at a park? Did you do games or no games? Thanks!