If you open up iTunes and go to the store:
- click on podcast in the store category list
- now click video podcast in the upper middle of the main screen
- back in the podcasts listing there is a sports & recreation - click that it's near the bottom
- after it refreshes now there is one more box further down
- in this final box there is an "outdoors" category - click that
- at this point I then search on kayak...but I like to browse through all of the other outdoor podcasts too.