To strengthen your ankles - here's what a Physical Therapist told my son to do after a high-ankle sprain:

balance on each foot (lifting the other off the ground) as long as you can.
repeat.

The wobble board adds additional range of motion, but just balancing on 1 foot strengthens all the muscles involved in balancing.  

If you're a wet-footer, look for rubber soled wading boots or boots for wet-foot fishing on coral. The original Patagonia 'marlwalkers' are what I use - and I don't just use them canoeing - I wet wade for smallmouth in them.

The chota mukluk soles are horrible on every surface, wet or dry. Like the warm feet when the waters cold, but they are slippery on everything.