First, my condolences on the gym.
Does the smith machine have pins on the front? Do you have anything that you can use to safely get the weight to shoulder level? You can always clean the weight. Then you can do squats or front squats.
Otherwise, hack squats are a good alternative, as are trap bar deadlifts, dumbell lunges, and deadlift walks.
For the hams/glutes, stiff leg deadlifts and hyperextensions will work those well.
If none of those will work for you, then use the leg press first with your feet low and very close together, toes out at 45 deg, then do them high, wide, feet straight. That will help work the different areas. This isn't a replacement, but it will help.