I went out with 10 of my friends to Ilocandia last May 29 - June 1, 2014 (Ikhay sorry I'm not at there to celebrate your birthday!). We went to the following places in Ilocos and enjoy a long ride from one town to the other.
Here are the places you can visit on Day 1 of your tour which we also went thru.
Calle Crisologo at Vigan
Padre Burgos Church & Plaza at Vigan