Ideas for 6yo's party? (Boy)

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Has anyone got any good ideas for a 6yo's birthday party, approx 15-20 children - birthday child is a boy, invitees half boys and half girls. I really don't have any ideas!

Depending on budget,

Lazerzone,
go carting,
bouncy castle in a hall with normal party games and food,
football training session
trip round a farm

Any good?