The authorities are more likely to let you into the tower if you have an Airport ID. I've seen several towers, from the sleepy quiet airport, the medium airport, and the major commercial airport. toured the TRACON, and the tower at the big one. Pretty cool!
But all those times, I had an airport ID.
I've done quite a few aspects of the aviation field myself. Spent time at a couple different airports working for the FBO, doing towing, fueling, catering, cleaning, etc. Great experiences. I have fueled everything from a C152 to a B747!
Next, spent some time as a dispatcher for a local ad-hoc freight carrier. Free travel, good people, and getting to see another facet of the aviation world. Both of these jobs were as i put myself thru MX school. I too got some rides in some pretty cool airplanes, including the L-188C and a B747!
After the freight carrier folded up and went under, I worked for a regional airline doing the ramp rat/gate agent thing. Demanding job, but great experience. Free travel, great hours, and just being at a major airport was enough for me.
Now, a mechanic, wouldn't trade anything for it.
All of the jobs in aviation that I have done have been great experiences. As far as a week only goes...not sure...but I would recommend any of the other jobs as a full-time gig!