A day trip, the farm like others suggested or the aquarium. Having a nice day out is special, you don't necessarily need a party 😊
Where abouts do you live? If you're close to shiremoor, shiremoor association do a private animal experience which I did for my daughters 2nd birthday with my parents, brother and my daughter. It was about 2 hours and she met rabbits, Guinea pigs, turtles, horses etc it was amazing xx
I'm in the same boat, we're thinking of going to White house farm or the beach as my daughter loves animals and playing in the sea.