There are some epic hikes in the region Nicky, one I would do (if I knew I could make it) is to the bat cave, timing walk has to be at low tide to reach these caves.
Dune hike from the village of St Lucia is approximately 11 km via the beach, when went along the beach the river mouth was open so could not cross with crocodiles and hippo in the region, heck throw in a shark as well who knows it may have been lurking beneath the waves LOL.
Ooo a bit of low tide danger thrown in to the mix, I know that feeling as well. I did a hike in New Zealand which required low tides but I'll get to that at a later blog.
11km isn't too bad but I guess there's a lot of hills and all the hungry wildlife you mentioned... It may be a run instead of a hike!
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Hopefully only the low tide to contend with, never done the hike but it sure sounds good.
Wildlife is the least of ones worries, easier than dodging drivers on the roads.