You've left it too late to begin specific training for the Orewa Half Marathon event. 12-15 weeks is whats needed, to do the best you can.
You're walking 10+ hours a week at the moment? You'll have no trouble walking the half marathon on the 5th. To be the best you can be on that day, in the short time thats left, i'd advise doing a long (easy) session this sunday then taper ie: have a light week next week (1 or 2 short, easy sessions) so come event day you are jumping out of your skin ready to go.
You say you want to run some as well... are you doing any running at the moment? How much?
Have you got proper shoes? (Ones that have been fitted to your gait, not just off the shelf).
If you are new to running take your time. I wouldn't advise ANY "fast" running for at least 6 months. Its all about building a base slowly by doing long, slow, easy runs. Once you have built this base you can add speed sessions few weeks before an event. I follow Arthur Lydiard's techniques, i'd recommend reading some of his writings, most notably "Run : the Lydiard way".
http://search.aucklandcitylibraries.com/?q=lydiard
Also "Complete or compete : half marathon", amongst others, by Jon Ackland.
http://search.aucklandcitylibraries....=jon%20ackland
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