I finally got the Island and Fort sets as well. I don't have any of the older Forts, but modelwise they do seem more interesting than this model. Apart from 2 barrels this set has no interiors at all... It has a decent amount of accessories, but I wish there were more. I really don't like the one-piece palm tree.
And using stickers rather that decorated pieces for the partly red brickwalls is a shame. What I do like about this set is the fact that it's of modular construction. It's built in 4 modules which use technic pins to connect in a similar way to the Cafe Corner. So you can move the modules around or build and add your own modules. The figs and the monkey are nice too (only set with the Govenor fig). Partwise it's nice, in particular you get several big blue and brown plates with the set, and overall it's a nice starting point if you wish to build your own fort.