Terribly sorry if this has been asked before

I have a 90 day non-immigrant b visa that is set to expire March 2 however, all the documents I require for the one-year extension of stay are not going to be ready until March 1, which seems a little bit risky

I was wondering, just to be on the safe side, if there is an easy or easiest or somewhat not too difficult Boarder crossing I can do from Thailand should I need to leave the country and get another 90 day visa Thank you very very much

I have booked a hotel in Bangkok that says it is SHA certified will this hotel be ok to use or does it need to be SHA+