Any of the places you mentioned should be fine. Just be sure to do simple things when you are there to land yourself a letter:
1) Try and read some stuff each night. 45-60 min should cut it. Read (out of "baby miller" or secrets) the IV induction agents section, Neuromuscular blocking/reversal agents section, and something about Rapid Sequence/Modified Rapid Sequence before you start. Then you'll have some idea of what the hell is going on during induction. You DONT have to memorize the stuff. Just check it out.
2) Ask the resident what questions are important for a preop and why. Then, after a few days, PREOP the next patient while the resident is in the case. You'll be loved. The resident will go over the preop with ya.
3) Watch a couple of IV's go in. Have the resident show ya. Then PUT THE IV IN for the next case. If you can't get it, no big deal. By the end of the rotation you'll be an IV stud.
4) Don't bolt out the door at 11am. Stick around to the oh so late hour of 2 o'colock PM. Unless you are in a "wicked awsome" case most residents will cut ya loose by then.
5) When the patient gets in the room help the resident PUT THE MONITORS/ARMBOARDS on. Ask where the leads go if ya dont know. You do this and you'll be loved.
If you do the above, before you know it you will be gettin to do tons of inductions, intubations, art lines, get to fiddle with the machine, get to extubate, place LMA's etc.
6) Ask the residents who you should get a letter from and who is fun to work with. Who is active in the ASA/ABA or well known/liked locally? If need be, take one CALL when that attending is on. Try to get into his/her room a few times.
Don't be afraid to ask the PD or Residency Director for a letter if you felt you kicked some butt and weren't a ghost. The worst they can say is no. Big deal.
I've had some really good students and I loved teaching them (or at least trying to). Once I see they do the above I try and let em do as much as they are comfortable with. I also try to put in a good word with some of the attendings whom I feel would write em a good letter. Hopefully someone will do the same for you guys.
Lastly don't be afraid to ask questions if you don't know. I'm not just talking about academic stuff. Im talking about stuff like:
How the hell do you prime an IV or drip
How the hell does this stop cock work
How do you pull back blood on an a-line
Wheres these leads go
How do you draw up drugs (seriously, I blew open bottle caps and spilled propofol all over the friggen place my first few days)
How the F&%K does this stupid bair hugger go on?
You get the point.