Shadowing after interview

Hello all! I had an interview on Monday and after the interview they asked me to come back and shadow. So I shadowed on Wednesday night. I wanted to send a thank you email for allowing me to shadow, but not really sure what to say. Does anyone have a sample thank you letter or any ideas on what I could say? I already sent a thank you email for the interview...any help would be appreciated! Thanks!
I also did the same thing. I sent a thank you letter right after my interview. I was told by a fellow RN that its best to just send one to the person you shadowed afterwards. Initially you shouldve said that you look forward to the opportunity to shadow and thanks to the director that way you've covered your thank you in advance to him/her. The thank you to person you shadowed should be along the lines of a thank you letter and bring up a specific event that occured that day. Hope this helps!!!!

Well I guess I didn't need to send a thank you because I got a call Friday offering me the position! Thanks for the advice though!