Thanks iceberg and zichar on the valuable tips.
Food wise, i think both my wife and myself are food lover so will not scrimp on food.. In fact, we already aimed many restaurants in both Barcelona and Madrid that we wanted to try. As we have been to Italy and Paris for our honeymoon before, so prices wise, i think Spain is still ok, lower than Paris but prob a bit higher than Italy.
As for camera safety, yeah, it's a concern and i specially bought a new bag thats a little less Camera bag like and can be pulled out so hopefully it will be fine. The tip about map reading is very true and useful and something that i always do. I only read maps when before i leave hotel, having meals or at some safe spots away from the crowd.
For hospital sant pau, i should be going unless time does not permit me to. As for Mont juic, maybe will try and go to the castle, prob give the sights below a miss except for the magic fountain. Still 1/2 hearted on whether to bring tripod as i doubt i will use much... maybe once or twice only at night.