How far is the destination from the place where you are residing? Are you staying at a hotel or will you be staying at home and going for a day trip. If you are planning on a trip that will be a few days long, you can find a nice place that is at a greater distance from your current location.
Is it a proper snowmobiling track or some place that you discovered? Doing snowmobiling on properly made and maintained tracks is a better idea than trying your hand at a random location. You can never be sure about a terrain that has not been fully developed. Also, in case of an accident, make sure there are enough facilities to get the injured to a healthcare facility quickly. This should be an important factor in your decision.
Kind of Landscape
Is it hilly or plain or a bit of mixture of both? If you like hilly areas and are comfortable with them, you should go ahead with such a place.
Your Skill Level
How good are you at snowmobiling? Are you someone who is just an amateur or have skills similar to a professional. The skill level should be kept in mind to understand as to what kind of terrain you can and cannot handle. Be realistic and select a location which you can handle with your set of skills to be safe.
What kind of terrain your gear and snowmobiles deal with? If you have snowmobiles that are of high quality, you can probably deal with harder locations with a decent set of skills. However, if it is of amateur in nature, it is best to have a terrain that is not too tough as you do not want to take too many chances.