J.F.
There is a hill at the main park in the newest section of The Woodlands (Creekside) off of Gosling. Last year they had the whole hill filled with Bluebonnets. It is a safe area to go without worrying that you or the family will be hit by cars!
Alternatively, a great place for pretty pictures is Mercer Arboretum just north of 1960. The plant life there is phenomenal and its a really popular place for wedding, prom, and graduation photos etc... I took my little girls there last spring to take Easter photos and there were several brides taking photos that day!
Good luck and God Bless!
J. F.