What should I write as my reason for extending a 60-day visa in Thailand?

Monday am off to Chang Watthana for a dummy run to extend my 60 day visa Monday.

I say dummy run as I have never done this before and incase i do a complete balls up (english slang for mistake) I can at least go away knowing what I need to do and any new documents needed.

I am doing the TM7 form at the moment and wonder what I write where it says "reason of extension" ?

I dont think putting, generally hanging about in coffee shops will do lol

Any suggestions to word this in a better way?

Also I dont know what time to get there really as I read its always busy even if you get there mega early. I was thinking leaving either 7am or 8am, I am near Saphan Taksin BTS and have a scooter.

Google recons 49 mins to get there roughly.

Thanks in advance.