So, what should I do now that I have an excuse not to run for a while?

I eagerly began my gym training today. I don’t know yet what the best plan is, but I’m hatching plans left and right.
One footed biking?
Rowing? (But no machine in my gym)
I need cardio. Can’t use elliptical or treadmill or bike yet.
Crutch running?
I air casted around today for first time.
In gym: 4 x ab machine, 130 lbs
3 x back extension
2 x abs on floor with 10 lb weight–side to side
4 x shoulder press, 40 lbs
3 x lats, 55lbs, then 70 x 2
1 x abs-core with elbows on pads, pulling legs upward
Good start but it all felt too easy.
I’m hoping to speak with a trainer tomorrow.
Most of all, I’m determined to keep at least 70% of my running fitness!