The prix fixe meal has an awesome salad bar with an interesting collection of side dishes, but the reason that you go to Tucano's is that they serve "all you care to eat" (which is so much more self-controlled sounding than "all you can eat") meat. Servers keep passing your table with skewers and what seem to be swords on which a variety of meats have been barbecued: teriyaki beef; garlic beef; various types of pork, turkey, chicken, bacon-wrapped meats, sausages, and so on.
It is rather like an orgy for carnivores: everything that you could want, and even some things that you might not: most of our table said no on the chicken hearts, but a few of the more adventuresome sorts said yes.
Of course, just like the other kind of orgy, when you are done, you find yourself saying, "I enjoyed it, but there's more to life than the pleasures of the flesh. And now I need to spend more time on the treadmill." (I guess that's better than the Enlightenment era bitter aphorism, "A night with Venus, a lifetime with mercury.") Think of it as an upscale version of Golden Corral, a recreational eating facility.
UPDATE: A reader asked how expensive this. The prix fixe was $20.95. Fortunately, you can register for a free meal in the month of your birthday, so that knocked the price down by half. Both my wife and my son-in-law had birthdays in January, so that turned it from an expensive meal (by Boise standards) to a fairly reasonable meal (by Boise standards).