Bayshore Half Marathon: Training Week Sub-Zero

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My next official half marathon (well, the next race I've registered for) is the Bayshore Half Marathon in Traverse City Michigan.  The race isn't until Memorial Weekend, so I've got a bit of time to train and I'm sure there will be some other races in the meantime.  I'm also working on tweaking my training plan.  I've been looking at a few options and consulting with my coaches (read - running buddies) about a few different training plans.

Right now, I'm just focusing on getting my base miles back up where they belong and trying to stay healthy.  My shin is feeling better but I managed to roll my ankle a little almost 2 weeks ago running in our first really big snowstorm.  Dumb.  I ran on it several times after that (because at the time it didn't feel like anything) and now it's pretty pissed off.  I'll be good for awhile, but then I sit all day at work like I did today and go to get up - YOWZERS.  I see lots of rolling, heat and ice this week with not so much running.

Here was my "training" last week:
Monday 12/31/12 - BIKE: Capped off 2012 with a 12 mile, 54 minute bike ride on my trainer.
Tuesday 1/1/13 - RUN: Started the new year with a fast 5. Ran a hilly 5 miles in 50:37.  One of my best runs in a long time.
Wednesday 1/2/13 - Strength/Cardio: 30 minute arms and a 30 minute easy spin after weights.
Thursday 1/3/13 - Strength/Cardio: 30 minutes legs and 30 min of speedwork on the treadmill. 60 second runs/90 sec walks for 20 min with 5 min wu and 5 min cd.  Major sweat fest and ran most of the run segments at 7 mph or about an 8:30 pace.
Friday 1/4/13 - Rest day
Saturday 1/5/13 - RUN: Longest run since my half marathon back in November. 7.3 miles 1:16:44 (10:30 pace). Ran with the 5/3 River Bank Run group - hills, a fast pace and good company.  Felt really good during the run but by evening, my ankle was so stiff and sore that I could barely walk.  Clearly I messed my ankle up more than I thought a couple weeks ago.
Sunday 1/6/13 - Rest day

I could use a little advice.  I have the opportunity to "run" a winter (read - snow covered trails with booze at the aide stations) half marathon on Groundhog Day.  Right now I don't think my ankle can handle it but I really want to do the race.  I have a ton of friends running and it's the inaugural year.  Sweet bling and a hoodie.  Should I go for it and just have fun or skip it?  I'm thinking it's early enough in half training to take the risk, but with all my injuries last year, I'm a bit gun-shy.