I am going to be in Hon Kong for 5 days in May. I have looked at both the Tourist Day Pass and the Tourist Cross-boundary Travel Pass. I am aware that the Tourist Pass is good for one day and the Travel Pass is good for 2 days. Should I buy 3 Tourist passes & one Travel Pass. I'm staying at the Cosmo Hotel. Where do I buy one and should I buy them each day or buy them all at once?