There are some good spots around Houston.
The Williams tower and Wall of water are a favorite, day and night
shot photo ops. at Hwy 59 and the 610 loop in the Galeria area. The
galeria area has some nice x-mas lights up right now
Downtown from afar can give some good shots, also there are some
interesting areas and art work through out downton, but there is
lots of construction going on down there
Near the Worthan center in downtown has a few nice structures and
along the bayou in down town houston is good.
There is Minute made park on the east side of downtown, and Reliant
stadium on the the 610 south loop right next to the astro dome.
here are some pics to give you an idea
http://www.james-benton.com/photography/city/houston/houston1.html
The Kemah Board walk is a good place its about an hour and 1/2
south of houston. Also while down that way you can visit Space
center houston.
The houston Zoo is not that good, but you can get a few good shots
there.
Moody gardens down in Galveston is pretty nice, its about 75 miles
from Houston depending where you drive from. There is also a flight
museum next to moody gardens.
James