I went to India a year ago,
had a K5, 18-135, DA40, FA77 with me.
I took 90% of the photos with the 18-135 and it did really well.
I would recommend to take only a flexible Zoom (WR if possible, but for rainy days a plastic bag and tape is not the worst option) and your favourite prime for available light and somewhat special pictures --> you will be happy about every kilo you don´t need to carry around.
Had no problems with thieves or anything,
but make sure to find a secure and secret place for your SD-cards (had around 200GB of them
).