Search Results: going camping

I want to go to Yellowstone with my boyfriend before our senior year (this will be after the government is working again, so ignore that nonsense about the parks being closed). I'm trying to figure out which will be the cheapest and the best.

My research:

Rental car:

$500 in gas

$200 for the rental car

Total: $700

Perks: No other booking, makes it an actual roadtrip

Greyhound:

$600 round trip tickets

$200 for the rental car

$100 for gas

Total: $900

Perks: The worst option, probably just best in case the cost of flights go up.

Airplane:

$500 for the flight (round trip)

$200 for the rental car

$100 for gas

Total: $800

Perks: No driving for 30 hours.

I rounded up for these and assume that gas would be like $4 a gallon. We have to rent a car, so it just depends on if we would drive there or get there another way. There will also be the cost of food and camping. I currently have no idea how much camping will cost per night (government shutdown means park sites about camping are down) but I assume it will be somewhere around $200. My boyfriend and I would split everything down the middle, so going with the rental (the cheapest) it'd be about $500 each.

Any of you ever done something like this? Care to share the experience? This isn't going to happen for two summers, so I have some time to plan. I just like planning things way in advance so I have plenty of time to save up and get all ready.