Each municipality will have one, although not sure about Arrecife this year.
Tinajo is a good one, it’s a living Belén, rather than in miniature. It’s usually on the main road in Plaza de San Roque by the church. Their lights are spectacular, so maybe leave to the end!
San Bartolomé (by the Ayuntamiento / Plaza de León y Castillo) & La Villa de Teguise (in front of el Sabio / Convento Santo Domingo)
Don’t forget to look out for the hidden caganer character (caca man!!)