Congrats on your loss, that's pretty spectacular in just three weeks!
I lost 50lbs last year, and my primary tool was the Sparkpeople website. Lots of tools on there to help you track, recipes, exercise ideas and videos, and it is all FREE. They encourage making slow, permanent changes that you can live with, and it has certainly worked for me. I hope to lose another 50 this year.
And yes, obese people can fit into and paddle kayaks, but it's a lot more fun to do everything when you're fit! I can't believe how much better it feels not to be carry 50 lbs I didn't need around with me. And my changes were all about exercise and portion control. I was already eating pretty healthy, just too much, and not moving enough.
Don't get me started about rally pot-lucks...