While I haven't cruise the Tropicale since Costa took it over, I did cruise here a couple of times many years ago. I understand that Costa did a wonderful job on the refit and she is quite stunning.
The one thing I remember clearly, is that she always feels crowded, especially on sea days. There is limited open deck space so people tend to crowd around the pool area (both the aft and the main). There is not a Promenade deck or sun deck that encircles the ship where one can either walk or jog either.
If the itnerary is port intensive, you should be fine. But, if there are a number of sea days, it might be another story. Hope that helps.