Cravings are crazy at this stage, but if you can curb those a bit and stick to lots of fruits and veggies, it will help your child not get sooo big that a tear or an episiotomy are unavoidable. Please don't interpret what I'm saying as advice to starve, by no means, just fill up with low fat/calorie foods. Your baby will have all the time after delivery to get nice and plumpy!
Also, there are a number of things you can do about your perineum and they all depend on your willingness to be a little unconventional.
1) Massage your perineum with Evening Primrose Oil. Here is a link on how to massage it. If it's uncomfortable doing it yourself, have your partner do it. I think that you being so close to delivering, twice a day is a must, more is better! http://pregnancy.about.com/cs/episiotomy/a/perimassage.htm
2) Deliver in a birthing center or at home - if your doctor is not open to delivering you in any other position than in the hospital bed - Why? If you use a squatting chair to deliver, you open up 30% more than if you were laying on a bed in a vertical position. Waterbirth is a most wonderful option too. Midwives don't protect the perineum when they assist water deliveries because the counter force of the water does it. Also, the warmth of the water reduces the perception of pain for around 70%! That's why so many moms choose waterbirths!
3) If you are delivering at a hospital, have your doctor protect your perineum while you are pushing.
Hope this helps!