Yellowstone National Park has 5 entrances for you to go in and out of the park. Depending on where you are coming from makes a difference as to what entrance is the best for you to use.
Yellowstone is up in the mountains with the Continental Divide winding its way along the park. Chances are if you are driving in the park you will cross it at lease once but probably more times then that. You will be doing mountain driving.
If you are coming from the west like California or Oregon you will probably want to come in the West entrance since it is the closest way into the park for you. At the West entrance you will drive through West Yellowstone on your way into the park. There are plenty of conveniences to go to in West Yellowstone like gas stations, grocery stores and plenty of gift shops.
If you are coming from the north your best entrance is probably the North Entrance that goes through Gardener, Montana. Gardener is a small town that also has plenty of places to stop if you want or need to before going into the park. You can also go through the North East entrance but that goes through the Bear Tooth Highway. The Bear Tooth Highway is very high and has many curves in it. If you do not like mountain driving this is the worst entrance you can go into the park. It is also the most beautiful way to get into the park so if you don’t mind mountain driving go ahead and try it.
If you are coming into the park from the east your best bet is through Cody, Wyoming. This is a very beautiful entrance but again there is hard mountain driving. I will take your breath away as you wind around the curves. You can also come in through the Bear Tooth Highway since the Beartooth is on the north east corner of the park.
From the south you can take the southern entrance. This is the easiest drive into the park since the mountains are less rough. The road is still very interesting and there is much to see and do. This entrance goes through the Teton National Park so you can see both Yellowstone National Park and Teton National Park in one trip.
Any entrance you take into the park is beautiful and fun. They all exit the park too when you are ready to leave. You can see detail maps of Yellowstone National Park at http://www.nps.gov/yell/planyourvisit/mapslist.htm.