Maybe if the bayou weren't so brackish...
The Chronicle runs a feature by Carolyn Feibel on the Buffalo Bayou Partnership's Sunday kayaking trip on the Buffalo Bayou.
While this blogger is generally a fan of leisurely sightseeing via kayak, sightseeing via kayak on that particular stretch of Buffalo Bayou doesn't sound that appealing (for free, let alone $50). For those who go, this advice from a Chron.com commenter seems worthwhile:
Make sure to take a shower with antibacterial soap, dress all cuts and scapes and insect bites, this water is polluted and full of sewage during some periods. Consider, going to another place, this waterway is an urban nightmare, even though it appears fine from a distance.