请帮忙检查一下这篇英文短文有没有什么错误,
Ihadahappysummervacation.IwenttoOlympicsForestPark.WevisitedBeijingNationalStadium.AswesayBird'sNest.It'sveryhugeandbeautiful.IthadheldtheopeningceremonyoftheOlympicGamesandisgoingtoholstheclosingceremonyoftheOlympicGames.IalsovisitedNationalAquaticsCenter.AswesayWaterCube.Itiscolorful.Ilikeitverymuch.AndthenwesawtheGrandFountain.Ifeltveryexcitedandhappythere.