mail the seeds back - dont carry them (the risk isnt worth it when you can do it via mail)...
And dont ask for the cannabis menu in a seed bank... they dont sell weed, but they do let you smoke your own. Sensi Seedbank is right on the way to the red light district. They have a few plants growing in the windows, but mostly a bar atmosphere. as i said above, bring your own smoke while you browse the seed books. theres TONS of seeds....
pick your strain, and mail it back to yourself as discretely as possible (or ask if they will post it stealth for you)...
Otherwise, just order when you get back like 99% of the other people on this board.