If she doesn't want to walk, then why make her? Honestly...you actually answered your own question here... Make the wrong thing difficult, and the right thing easy.
If you ride in an area you can work in, then if she wants to fuss and jig about, then put her feet to work. Then when you've worked her for a good while, ask for a walk again, and if she walks, then leave her alone. if she starts to fuss, put her feet to work.
My mare can get antzy in the arena, and on the trail; she has a busy mind. So rather than try to rein her in, I put her butt to work. I can send her anywhere, that is not a problem. So if there are lots of trees to weave in and out of, I will trot around those for a good while; if there is an open area where I can lope figure 8s, circles, serpentines and such, I'll do that...the key is, I make it hard for her to be antzy and 'unfocused', and I refocus that attention back on me, and I make sure to make her want to slow down and take in the scenery instead of rush through it!
I don't think you have to 'settle' for your mare not being a trail horse, you just have to figure out how to work her through it, and stick to your guns on it, because she may not 'get it' in the first couple of rides...
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 05-18-2012 at 12:49 AM.