Is the placement going to be private?Ideally, the hot tub would fit into a private area of your property. For a clearer sense of the privacy afforded by a location you're thinking might be best. Mark the dimensions of a tub with a hose or a length of rope. Track the sight lines from different vantage points around the yard, inside the home, and even off the property.
Also, keep in mind that in some areas, building codes require hot tubs to be surrounded by a fence. Perhaps building that barrier would contribute the extra degree of privacy you feel is missing?
Is you spa going to be safe?Easy access is important. After all, when you're retreating to the tub for a peaceful dip, the last thing you want is to slip and fall on the way in. To make entering and exiting easier, you might install the hot tub in-ground.
Consider integrating the spa into a new or existing deck. Also, insist on such basic and essential safety features as automatic shut-off and a strong, locking cover. These are not bells and whistles to skimp on; they'll offer peace of mind while promoting the well-being of your family and neighbors.