Halo Halo de Iloko is a great place to try Filipino dishes. The decor includes bits of old furniture and framed comments of famous (I think) people who've been there.
Out of the dishes we tried, the Sisig Iloko was the best. We tried the okoy, which was also very popular, but liked the sisig best.
I would suggest going a bit earlier in the day, to best savor the icy coldness of the halo-halo.
Halo-halo de Iloko
San Fernando, La Union