Good job on taking advantage of the RE market!
This question probably applies to anyone who has $60K and a 2-3 year spend horizon so everyone is out there hunting for the answer (with exception of the 529 option that is on the table for you).
Ultimately it depends on how much fun you think it will be to develop an investment strategy vs. how burdensome it is. While I don't think it is going to be possible to generate substantial growth/dividends from this sum, you can still do well and get 10%+ perhaps if things work out, so definitely worth the hassle. Of course, the yield reality is that CD's and savings accounts are not going to produce more than just 1-2% per year since the rates are low. Stock market is doing better than ever, which some feel means, it is not a great time to buy, esp with your short-term horizon. Bonds and date-based funds are going to be just weak in terms of the yield.
I am not an investment adviser and you should research it on your own. However, you could built out a custom portfolio with 20-30% in Stock funds (growth), 20-30% in Bonds and 20-30% in Cash CD's/High Yield Savings accounts. You can then start with cashing out your best performer (either stocks or bonds) and then draw down the other instruments. Make sure you consider the tax implications. There are good and bad - good is that you won't have much income in school years but you will be taxed on dividents along the way so you may want to consider tax-free bonds (depending on your tax bracket). This would give a good chance to capture any growth from equities but also protect yourself with bonds and cash. Should the worst case happen and some of your equities go down more than 10%, you can always not sell them and wait for the market to recover. However, the percentages should be based on your risk tolerance, at our age, it tends to be pretty good since most of our productive lives are ahead.... and yes, get a life insurance.
Good Luck!