Malaysia forum

I am returning to SE Asia this fall and wanted to start this trip in Malaysia, having never been there before. Looking at the peak travel/tourist seasons and the monsoons I was thinking of arriving in September, spending a little time on the peninsula and then most of October wandering from Kuching to Brunei and then flying back to KL and on to other destination in SE. Maybe Vietnam or where ever. Air Asia makes it SO easy and cheap. Anyway...

I am travelling alone and can figure out places to go, etc, without too much fuss. My main question is: Is this a reasonable sort of general itinerary to avoid the big tourist rushes of July and August and still catch good weather before the East Coast monsoon tides?

Thanks in advance!