I’m travelling to Thailand with my husband and two young children, we are arriving in a few days on the 30 day visa exception from Canada. We would like to extend our stay an additional 19 days. We will be in Phuket for the first part of our stay (18 days) and going to Krabi. What do I need to be aware of to extend for the additional days? When I arrive in Krabi after 18 days will that be enough time to apply for the additional days?