You might have to be more specific about where you are exactly (the name of the place you're at), cause the way you described it, it sounds like a lot of the stages in the game.
Or maybe I just forgot cause I finished Ico a long time ago. All I can say is throughout the game, there are no surprise tricks, everything is common sense and pretty easy. And yeah, look up game faqs for some walkthroughs or something.
I love Ico. Wish there were more games like it. Too bad nobody knows about it.