You so need to get a girls perspective as obviously girls know what girls want... What MeEtc said would be really nice, if I got that on valentines day I would think it were really sweet. I know boys think girls love chocolate but we don't so much like gettin it off boys for valentines (imo anyway). Most girls are weight concious anyway and chocolates dont really suggest much thought or care.
As for teddy bears we love em'
We get them and go "Awww" and there just generally nice to get.
Take her to her favourite movie and then maybe take her out somewhere to eat and just make it really romantic, we love the slushy stuff
But what wacky said also true, girls would prefer to get loads of love and attention on valentines than get loads of stuff without any feeling at all. Just hold her hand alot and kiss her often...
Tell us how it went when the times over
Hope this helped