In my opinion kayaking solo is not very different from kayaking with a group of 2 or more. The same rules apply. Travel within your limits. Assume no one will be there to rescue you. Be self sufficient. I completely agree with the judgment, judgment, judgment,... comment. Forget the flares, VHF, phones, etc. The day you rely on these are the day they will fail to do what you want. If you're human the ocean/weather is always capable of being more than you can handle. I'm not saying don't bring them but you need to guard against the propensity of them clouding your judgment. At the end of the day the old salt "there are bold bush pilots and there are bold bush pilots but there are no old, bold, bush pilots" pretty much sums it up.