If you did something specific:
* "Fui a [place] con mi familia." (I went to [place] with my family.)
* "Pasé tiempo con mis amigos y familia." (I spent time with my friends and family.)
* "Fui a esquiar/a la playa/a visitar a mis abuelos." (I went skiing/to the beach/to visit my grandparents.)
* "Hice [activity]." (I did [activity].) Examples: "Hice un viaje en coche", "Hice muchas compras", "Hice un curso de cocina".
* "Estuve leyendo/viendo películas/jugando videojuegos." (I was reading/watching movies/playing video games.)
If you want to be more general:
* "Relajé mucho." (I relaxed a lot.)
* "Disfruté mucho." (I enjoyed myself a lot.)
* "Fue un tiempo especial para mí." (It was a special time for me.)
Here are some examples with a little more detail:
* "Pasé las vacaciones de Navidad en la casa de mi abuela en el campo. Comimos mucho, jugamos juegos de mesa y vimos películas juntos." (I spent Christmas vacation at my grandmother's house in the countryside. We ate a lot, played board games and watched movies together.)
* "Viajé a México con mis amigos. Visitamos ruinas antiguas, comimos comida deliciosa y nos relajamos en la playa." (I traveled to Mexico with my friends. We visited ancient ruins, ate delicious food and relaxed on the beach.)
Remember to adjust the answer to your personal experience.