@Frederick ********
Legally, the owner of your condo is responsible for registering you. There is an online system, but this requires that your landlord register with their details (and sometimes it takes weeks just to get a username and password). Legally, this registration must be done 24 hours after you change addresses. Alternatively, if you're traveling with a Thai, you can make all the reservations in the name of your Thai friend and (potentially) not show your passport when checking in...Alternatively, many airbnb hosts will not ask for your passport, so going that route may also save you the hassle.