Now that we finally have a house and my old r daughter will be turning four and actually understands what a birthday party is, I am excited to have one for her! But I am not sure what to expect. How much "entertainment" do you need for a 4 year old bday?

I'm envisioning it at home, mostly outside in our backyard and back deck (weather permitting), morning to lunch time probably. Do I need to plan games and such, or other entertainment (we've been to parties with petting zoos and appearances by Anna and elsa, which seems over the top...). Not sure how many people we would have at this point.

What have your experiences been with parties for that age?