On my way to extend my visa exemption for 30 days, down in Krabi. I have read something about needing to provide the address and phone number of where I'm staying currently. We're house-sitting for a friend; should they have 'registered' us like in Vietnam? I don't want to get them in trouble - can I just give a hotel we stayed at when we first arrived, or just the hotel next door, maybe? Does anyone check?