Ecuador Camera D90 lens recommendations

[3d]

For the D90 (DX format) two lenses come to mind immediately:

Nikon 35mm 1.8G
Small compact everyday walk around lens.
http://www.kenrockwell.com/nikon/35mm-f18.htm

Nikon 18-200 VRII
Wide range from wide to zoom. Kinda big. But very versatile.
http://www.kenrockwell.com/nikon/18-200mm-ii.htm

These lenses are extremely common and available on the secondary market.