Conjugation of "ser" help

How would you conjugate "Ser" when using "our."

My sentence is: Our favorite activities are

I think it is either: Nuestras actividades favoritas son
or
Nuestras actividades favoritas somos (since our could be considered we, since I am included??)

Also, when I go about listing the activities, do I conjugate them according to the "ser" verb, or keep them in their "to be" form.

For instance: Nuestras actividades favoritas son mirar las peliculas
or
Nuestras actividades favoritas son miran las peliculas


Thanks!!!

woops, could a mod move this to "spanish to english"

The correct form would be "Nuestras actividades favoritas son", because you conjugate the verb with "actividades" acting as "objeto directo", meaning it directly receives the action of the verb you use. The same with the list. "Nuestras actividades favoritas son mirar películas", because the verb referres to the activity itself and not to the person doing it.
Hope you find this useful!