The bus is fine. But if you are going with 3 or 4 friends, it will cost $9 round trip for each person every day you need to take the bus. However, it probably won't snow every day and maybe not at all while you are there.
You might be able to book an suv as well and cancel one with no penalty at the last minute. If snow is forecast, cancel the car and vice versa. Now, I have been offered upgrades to awd or 4wd for only $5 or $10 extra per day by nice car rental agents in the past a few times but don't count on it.