Two words, ONE PIECE... that should take up a good part of your summer... unless you decide to ignore sleep and food lol.
As for YuYu Haksusho, Inuyasha, Dragonball,Tenjou Tenge and Naruto, I have already watched in anime. I'm usually not keen on reading something I've already watched before, unless the manga and the anime are turns out to be vastly different, like FMA. I do realize manga are usually better in terms of less fillers (like D-Gray Man... my god the anime sucked ) so it might be worth while reading the manga instead of watching the anime.
I got to say it... After 17 years of reading Berserk, she thinks One Piece drags on too long?
Yes, One Piece drags on hard, but it does so with clear and definite beginnings and endings. I love it a lot, and I personally can't bring myself to read Inuyasha or just about any Marvel/DC Comic yet.
Prince of Tennis
Hana Kimi maybe?