The five dollar (approx) phone mic thingy from Radio Shack works fairly well. Several drawbacks/issues. You need to be able to place it on the speaker for it to work. So the shrubbery speakers, speakers in the doom buggies, etc. It needs to be pretty much right on the speaker for it to work. If I remember right, it works about maybe 1 inch away. But if it moves from side to side, the sound changes slightly. Also, if you are anywhere near something that produces interfearnce (some examples TV screen, power lines, etc) you get a nasty hum in the background that pretty much renders the recording useless. Third problem is that it just produces a mono track. Left side only I believe. It's easy to fix by just mirroring the left on the right, but you lose any stereo effects.
Plus side - it's cheap (cheapest decent mic I have found) good quality, (hard to tell that it was done on the sly) fairly easy to use.
Problem with it being so good, you end up with recordings that can (and will) get mislabeled as originals from the masters and such when they are really still fan recordings and could be better.
Whether you use this type of setup, or mics, try not to be obvious. Some cast members will be obnoxious, even though most attractions do not specifically condone audio recordings. Also, with the nation in its current state, being suspicious and walking around with extra wires dangling all over your body doesn't make security love you.
Minidisc recorders are great (I listen to 5 hrs of music on one disc for 40 hrs on one AA battery) Beats cd and tape any day.
Never thought of using the ALD, will possibly try doing that next time around.
Hope that helps,
Dreamfinder