You cannot take a lump sum on the 401K plan, as the original poster had asked. Well, technically you could take it, and pay the additional tax penalty, but don't do that. You need to decide whether to keep the money in Fidelity or to roll it over into something else. Will you have another job, one that has a new 401K, or is this it? You'll need a financial advisor, but note that they may be in the business of selling you financial instruments, so they may be biased (really think before you act).
One consideration, but it's very hard and is an individual decision - if you have your money in a 401K and the money is mostly in stocks - think about the market being at historic highs, and about your risk tolerance for losing the money. I fear another 2008 could happen, or even worse. If you are just a few years from retirement, you don't want your 401K to drop 30% and you find you no longer can afford to not work, think about safety for your investments (maybe even include money market/cash, bonds, or guaranteed annuities in your mix?). In other words, you might want to really think about capital preservation rather than gains, at this stage in your life.