I have a Trip Computer page on my Garmin Venture HC. I have it set to record miles on the trip odometer, speed (which is at the current rate and it of course fluctuates, moving time, max speed, stopped, (I think this shows the minutes/hours that you are standing still - hahaha, not really totally sure on that one!) moving average speed, time of day and Odometer which keeps a running tally of miles.
I have other choices such as elevation but because I live on the coast on the flat land I couldn't care less about that. I would change that if I were riding some place where it mattered.
Joe, I can lock the cells if that will help you. That way you can't delete the formulas but can add data. I can remove the goal and add speed and average speed.