I'm so envious of you! I still live under the shadow of writing my master thesis (it kills me) I can't wait when I'll be carefree and able to watch dramas without guilt... Anyway...Some suggestions:
Bloody Monday - it's super intense, I really enjoyed it.
Code Blue - well it's about doctors, it doesn't have much romance, but it has a lot of action, and it's really well done.
Down with love- a rom-com, it's quite cute, and the leads did good job, but you'll want to kill the evil ex in this one.
First Kiss (jdrama)- I go around recommending this one, because I really like the love story in it, Inue Mao was quite sassy here too.
Ghost Friends- I don't know why, but it really got me hooked at some point, and emotional later. There was just something extremely good about the leads interaction.
Hot Shot - some sport (with funny special effects), some love, bromance, and Show Lou
Hungry! - I watched it in one night, it was quite good
Juui Dolittle- I know, it's about veterinary doctors, but I'd watch everything with Oguri Shun in it, and this one was surprisingly good, not much romance though.
Kimi wa Petto - a good and original romance
Liar Game- it's weird, but it's good, and the second season is even better
Love Shuffle- funny and original rom-com
My Girl - it might be typical, but it still a fun rom-com - well, you wrote you're fine with cliches.
Nazatoki wa dinner no ato de- if you like criminal mysteries, and I never liked Keiko before I'd watched this drama, now I do.
Nodame Cantabile- best drama ever! well... at least in my opinion, but please do try it.
Skip Beat!- personally I really liked it - especially middle episodes
TOKYO dogs- comedy, action and Oguri Shun again, there is even a bit of romance
Yankee-kun to Megane-chan- funny high school drama
Yume wo Kanaeru Zo- a bit weird, quite unknown, but I liked it so much that I watched it twice already
I hope you'll be able to choose something to suit your taste, have a fun summer. And please do go out sometimes, don't watch dramas ALL the time ;)