1 year anniversary gift idea?

On july 9 me and my girlfriend will have been dating for a year. I want to give her the best day ever. I plan on spending the whole day with her then coming back to my house in the night. I want to do something for her that would make her happy and surprise her. (For example this video http://www.youtube.com/watch?v=pnVAE91E7kM except obviously i am not proposing, just that idea.) i am only 14 years old so i can't drive her anywhere so i need something that we could do within walking distance. i was thinking something to do with the beach because there is one very near my house. There could be a surprise waiting for her when we get there or something. (the beach is private so there wouldn't be any other people there.) hopefully you can come up with some ideas for me. (Im not looking for presents to get her, im looking for things to do for her.)