Taking my NEX-5n to Lima, Peru which lens to take?

I'll be staying in Lima for 2 weeks. Yeah, I know , I"m stuck in Lima. But on my days off I wanted to go to Barranco and Miraflores to do some street shooting and obviously, taking some pics of kids in the family.

I would like not to change lens as is dusty where I'll be staying and really want to go as light as possible.

So, being my first time taking my 5n out of country, I'm deciding if to take the kit lens, Sigma 30mm or even the 19mm. Any recommendations?