I don't usually play family based adventures (I'm more of a mystery person). But considering the fact that I loved first game, I was willing to give it a shot.
Beginning of the game was not much exciting. Suburban family getting packed for the trip (well it isn't exciting in the real life so they got that right :D). But lets not be hasty and judge the book by its cover. Now when you get to the first national park, thats the place where the fun begins.
Hidden objects are well built. A little challenging at the beginning and they get more and more challenging further in the game. I personally like large HO-s. There is small list at the beginning, i think 9 items at start, but it gets populated quite a lot (i would say 20-30 items minimum per HO).
Art style is nice, somewhat photorealistic, much better than its predecessor. Cartoonish style on photo-ops is in my opinion nice touch, same as change in interface once we leave town and change of characters in some parts of game (e.g. added helmets in chapter 2, I won't spoil anything).
Music early in the game does get slightly annoying, few short tracks that are looping, but more of them come later. But I think music style really hit it.
All in all great game, i like it, my kids love it and would like to recommend it to fans of the genre. Just give it a chance and I promise you won't be sorry.