Just to add in my 'experience'.
Since you are new, your present lens should serve your purposes, unless this is your 'once-in-a-lifetime' trip with special occasion.
I have high regard for king tiger advices here, but for once, I differ. The wide angle, 12-24 etc, will be too 'restricted' for you and, as you admitted yourself, you may not in a position to fully capitalise the wide angle...
Maybe can consider the 30/1.4 or 35/f2 for your low light condition....
BTW, I learn it the hard way and spent alot of my sweat $$ on many good lenses in my dry box. (still dun know how to use them and getting lazy with the weight burden).