Here are some secrets I found while outside on the grounds.

1. cast spongify on the carpet to your right to get a bronze wizard card.
2.go to the underground area.cast alohamora on the crack in the wall.cast diffindo on the weeds and branches . cast lumos on the statue.now go to the large building/wall on the oposite side of the Quiddich Pich.you should see the wall disapere.now go up and collect your prise!!!
3.when you pass the first open door on your way to the greenhouse look way up untill you see the spell simble.cast flippindo on ot and you should see the wall open up.now go through it and get your reward!!!!
4.Go to Hagrids Hut.jump into the pig pen and onto the big log to get the bronze wizard card.

If you found anymore send me an E-mail at:
spongebob90@houston.rr.com

quote Spongebobfreak

2.go to the underground area.cast alohamora on the crack in the wall.cast diffindo on the weeds and branches . cast lumos on the statue.now go to the large building/wall on the oposite side of the Quiddich Pich.you should see the wall disapere.now go up and collect your prise!!!

i cannot find the wall wich is opened by the lumos spell mentionned in number two

The wall that is referred to isn't very well described. I had trouble also. Finally, I found it. After you cast the Lumos run quickly up the stairs and then turn Harry to the right. Run straight from there. You will then see the wall. HTH

i am still confused

You run over to the wall, it will be illuminated by the Lumos. Go into it and up the stairs. There are several beans and a chest which contains a wizard card. After you collect all of those things, go to the patch on that level that is slightly off-color. Jump on it while facing the castle and you will see a spot on the wall open up. Go back down the stairs and jump on the Spongify carpet below (if you have learned that spell at this time) the opening and discover a secret for the grounds and collect what is in side.

-Bringing this back up for the use of seekers/guests in need in the future-

This secret is at the right after you've gotten outside. Turn right,go pass the Spongify-carpet and you'll see some kind of "Medusa-face" at the wall.Open it with Alohomora.And if you have learned the spell that kracks twig
(dunno what it's called in English) you can also collect even more beans...Did that make any sense???

i know that one

quote Kikki

(dunno what it's called in English)

It's called Revnio.But that's becaus it as been translated of courseGot the Norwegian version.

oh thats interesting, what are all the other spells called in your version?

Of topic...

Diffendo = Revnio
Flipendo = Vippendo (not much of a change there...)
Skurge = Skrubberunt
Spongify = Sprettiletti
Rictusempra, Alohomora and Lumos is the same