on a picnic
No quiero ir de picnic con Tom.
I don't want to go on a picnic with Tom.
We went on a picnic together.
Aún puedo recordar la vez que fuimos juntos de picnic.
I can still remember the time we went on a picnic together.
A menudo se van de picnic en bicicleta.
They often go on bicycle picnics.
Fuimos de picnic a pesar de la lluvia.
We went on a picnic despite the rain.