I bought this because I wanted a map of all of Croatia, not just the coast. The map advertises itself as being at the useful scale of 1:300,000, but nowhere on the cover does it admit that the inland areas around Zagreb and further east are at a scale of only 1:700,000. Naughty!
The map is shaded to distinguish altitudes at 300 m intervals. There is no shading to indicate forest.
If you don't require a map to cover areas away from the coast, I would instead recommend the Marco Polo maps at 1:200,000. There is one of Istria and the Croatian coastline as far as Mostar, and another continuing (overlapping) further south as far as Dubrovnik. These do not indicate altitude except by some artistic shading to indicate mountain ridges, but do indicate forest.
More detailed maps, at least of the coastal regions, are not so hard to come by in Croatia itself.