Visiting Phoenix in 2 weeks, what neighborhoods should I explore?

[Ryan Bertolami]

Visiting some family in Phoenix soon. I live in LA, am new to REI and have been in the learning and research phase. Most interested in buy and hold, brrrr, 1-4 units that cashflow.

I'll only have the weekend, but would love to get some time in walking neighborhoods. Where should I explore? Up and coming areas? The freeway extension that bypasses downtown, does that go through anything interesting? Is there any new light rail planned? what's the scoop? :)