Re: So, I'm going stateside tomorrow..
You're a musician obviously..SO go down to the West Village on a weekend night.. and make an evening of it. Lots of little pubs & bars & cafes, with all shapes & sizes of live music will bekon you.( Blue note, Fat Tuesdays, Peculier Pub, The Bitter End,The Bottom Line, 55 bar Its a must do for the out of towners.
Check out BB King Blues & Grill mid-town, 42nd street.
Try and see a Broadway Show or if that's too unmanageable, ( ridiculously expensive tickets to most of the hot shows ) try off - Broadway.
Go see the MOMA ( museum of modern art, & the guggenhiem, & the metropolitan museum)
So see the little art boutiques of soho..
Play some pick-up basketball ( anywhere ) if you're up for it
Have a steak sandwich at Sardi's, Lindy's cheesecake.. have fresh bagels in the morning with coffee & cream cheese.
Take the Circle Line cruise around Manhattan if you just want an easy laid back spin around the island.