More of the best:

BATON ROUGE AREA INFO & REVIEWS:
225Magazine (search for current events, food and fun online)
Clarence's review site at CajunRadio.org
2theadvocate (review of locally owned restaurants)

NATURE TRAILS AND EXHIBITS
Bluebonnet Swamp (direct link) (walking tours)
LSU Burden Center (horticulture research & Windrush Plantation)
LSU Hilltop Arboretum (extensive collection of native trees and shrubs)

OTHER:
Bluebonnet Library  (great library with an awe inspiring view of BB Swamp)
Perkins Road Post Office  (simply convenient)