What to do at a sleepover with a boy, girl and a baby?

So my cousins are sleeping over and i haven't seen them in a year…
i'm 13(a girl) my sister is 8(a girl)
my cousins are 10(a boy),9(a girl) and 2(a girl)
they are staying over at my house for a catch up and we need suggestions on what to do!
we live near 3 parks, we have 2 cars(for transport), i get £10 pound a day pocket money(incase we go out and need cash)we have 4 ipads(there will be enough for 4 of us), i have an iphone 5c(any good apps to play on?) we have 2 computers, a computer connected to the tv and 2 macbooks(for internet) and a 3d tv(for movies) and my mum and dad have money for if we decide to go out… Or order food? My cousins are going to bring their ipod, dsi(to connect to my 3ds) and also we have 3 cameras and a canon eos incase we decide to make a movie >.<

i need ideas on what we can do to prevent us from being bored! The baby keeps herself entertained and she has some baby toys at our house… I just listed the above to give you a few ideas on what we have…

The park is a GREAT ideal it is some thing every one can enjoy. You can play TAG [I'm sure yous have played it before] Kick a ball to each other even the baby can play, fly kites, have a cook out party with parents, have a picnic. Have group talk to catch up with what is happening and a group talk on things ya'll have done together in the past

Play BOP IT!