I try it. sorry terrible English :P 嬉しい＝grad or happy 楽しむ＝be fun or enjoy if someone give you a present, you will be happy. (be fun? maybe not, i think) same in Japanease. "楽しむ" needs some action. 私は野球を楽しむ(I enjoy playing baseball) 私は野球ができて嬉しい(I am grad to play baseball) 喜ぶ is a verb and third person view expression. I am pleased. "私は喜んでいます" a little rare expression. "私は嬉しいです" is better. but She is pleased. "彼女は喜んでいます" is good.