MM,
Personal approach: I find it virtually impossible not to race once I get a number on. I did my first marathon this year and did a half about 5 weeks prior. I didn't taper for the half, but I did allow some recovery time afterwards. Like you, I had a bit of an injury problem, so had to take it easy once the race was over -didn't want to jeopardise the main event! I didn't go for complete rest, just reduced volume and no hard workouts the first week, and then building back up in the second week (just about in time to taper properly for the marathon!!!)
I think I'll end up doing the same again next year. Try and treat it as a training run. Fail miserably once the race gets underway, and then allow myself recovery time in the week or two afterwards.
You'll have plenty of time to recover properly and still get some good training weeks in before your marathon taper.
All the best!