Info Links:

Some general paddling sites, and some with regional trips & routes info:

http://cajuncoastpaddle.com/
https://wetlandswanderer.wordpress.com/
https://www.rivergator.org/

​On​ly one entry for Louisiana, but a nice resource in general:
http://www.kayakguide.com/USA/Atchafalaya.htm

​Not kayak/canoe specific, but very descriptive:
http://neworleansoutdoorcompanion.blogspot.com/

Tours, rentals, clubs, social media groups:
A very well established regional paddling club, with an active message board:
http://www.bayouhaystackers.com/index.htm

My Facebook Group:
https://www.facebook.com/groups/nolapaddlesports/

Lafayette Paddling FB Group
https://www.facebook.com/lafayettepaddleclub/

South Louisiana Paddle Adventures
https://www.facebook.com/groups/1876492312670389/

South Louisiana Paddle Sports
https://www.facebook.com/groups/684267475034953/

Gulf Coast Kayak Connection:
https://www.facebook.com/groups/186439704763652/

This is the Battle on the Bayou FB page, but it's also become a regional bulletin board, of sorts:
https://www.facebook.com/groups/355840449786/

I'll play favorites a little bit, but there are other tour groups around. These first few are people I know, and/or have great community involvement. I'll update and try to list any tour groups or rental companies I know of:

Great tours, rentals, good people--if you're in the area without a boat but want to paddle, look them up:
https://canoeandtrail.com/
or on Facebook:
https://www.facebook.com/canoeandtrail/

Same as above--they do a lot to keep Bayou St John clean and clear and they're just good people:
http://kayakitiyat.com/
Facebook:
https://www.facebook.com/kayakitiyat/

Great tours, with a goal of bringing the need for wetland preservation to the forefront:
http://lostlandstours.org/
or, on FB:
https://www.facebook.com/lostlandstours/

My friends on Bayou St. John, offering recreational kayak and paddle board rentals. Very reasonable rates, very friendly folks:
https://www.bayoupaddlesports.com/
and on Facebook:
https://www.facebook.com/TheRealBayouPaddlesports/

For paddle boarding rentals and lessons on the lake or Bayou St John, or occasional trips to other places, and to find out about the local paddle board club, visit Jeff at:
http://www.nolapaddleboards.com/

Wild Louisiana Tours:
https://www.facebook.com/wildlouisianatours/

Louisiana Kayak Company (Venice, LA):
https://www.facebook.com/The-Louisiana-Kayak-Company-1630163730537226/

Also, search Meetup.com for local groups--there are several specifically for kayaking and canoeing, and some outdoor groups that often have paddling meet ups. Here are some that I belong to, to get you started:

https://www.meetup.com/Kayak-Nola/
https://www.meetup.com/Mississippi-Kayak-Meetup-Group/
https://www.meetup.com/neworleansoutdoors/
https://www.meetup.com/North-Shore-Kayaking/