OK, here is my city plan.
The sites are numbered from 1 to 15, but I have changed the order since then.
There are three rings of cities in this plan, as you may see. (you may also notice a forth right that I covered over - sadly, the undo button doesn't go as far as I would have liked)
Please feel free to suggest your own orders. I will ammend this later. My suggested orders are:
A) as the numbers say - not the best order.
B) In the following order: Ring 1: 1, 2, 5, 11, 4; then Ring 2: 3, 9, 10, 7; then Ring 3: 6, 8, 12, 13, 15
This order is logical, from inside to out.
C) Outside in technique - Ring 3: 12, 13, 15, 14, 6, 8; then Ring 1, then ring 2 as shown in suggestion B.
EDIT: Thanks HEAPS to TF and shaitan for removing those pics. I will put them on an attachment.