Lyn, I'm with you on the weight and the motivation! We're so close! I also use a bike (stationary and regular 2-wheeled type) though fortunately without the foot problems.
I do cardio of some type most days of the week and lift weights several times a week also. Weekdays my workout is usually an hour and fifteen minutes or so. To ramp things up, I can and do notch my workouts up a little, but you can't do that too much without hurting yourself. I'm in the process of doing that now, as my heart rates aren't really getting to where I want them to be on the bike and I'm capable of more reps or higher weights.
So, to ramp things up in a different way I'll engage in some kind of major calorie burn once a week - hiking will do it for me and so will swimming with my kids.