NPC Path-Finding Help

[kingcj]

Before I do this I wanted to run it by someone and possibly get some feedback.
Could I set a group of variables up to check the tiles and then direct the npc to non-blocking tiles closest to its destination? It sounds possible, but it would be a lot of code and then some equations to determine which non-blocking tiles are closer to the npcs destination. Also is there a way to cycle through the variables to input them into the equation? (such as with a loop?)