So you’re driving along and you find a time machine in the middle of the road. The instruction manual says the machine only lasts thirty days for some reason, after which you will be automatically teleported back to the present and the time machine will self-destruct. What time period do you relive?
Berlin: October - November 1989
Bauer- und ArbeiterDoper
Any late-spring month in New York between 1900–14. I love the clothing, the music, the architecture, the theater . . . And I’m sure after a month I would be “dee-lighted” (as President Roosevelt says) to get back to my own time, turn on the a/c and watch whatever shows I’d taped in my absence.
Broodha, you pre-empted me there! what I wouldn’t give to be one of the people sitting on top of the Berlin Wall, watching the river of Trabants stream through the Brandenbruger Tor. I’d also live to be in Prague for the ‘Velvet Revolution’ at around the same time. I know people who were there at the time, and it sounds like an unrepeatable event, a peaceful revolution led by poets and artists, supported by all the people, even the ones who were being disempowered.
I’d go to Birmingham, Alabama, June 1964, and meet my father.
Montreal, July 1967, to attend Expo 67, ride the original metro system, and smoke a lot of pot. 
- s.e.
I’d hang out around a certain tomb outside of Jerusalem around 30 CE* - see if that resurrection business really occurred.
Otherwise, along the lines of bup, I’d go back to the late 30’s and meet my maternal grandfather who died in 1953.
*based on my Oxford History of the Biblical World that is.
I have a small number of girlfriends who I should go back to see. But, I guess I’d op to sit for just one more time in from of a tv one summer and watch Sam Ervin and a few others go after Nixon. Watergate hearings. Best damn tv in my lifetime.
That was my thought too, and a lot of us think alike in this, apparently.
It may have been the happiest “moment” of the 20th Century. I thought I would seen more posts about learning the mysteries of the more distant past. But we just want to be part of a massive, happy party!
As it should be!
option 1: (kinda a cheap answer)
Go back to September 10, 2001, and phone in some anonymous tips
Option 2:
August, 1945, and manage to be present both at the Japanese surrender ceremony on the U.S.S. Missouri and at Times Square around the time of the famous sailor-kissing-a-nurse photo
I’d go back to January, 1986. Then, on the morning of the 28th, the major news outlets would receive anonymous packages about a sabotage attempt on the Space Shuttle Challanger, complete with diagrams outlining the affected areas of the shuttle. The FBI and CIA would have received similar packages the previous evening.
On a related note, did anyone here ever see the new Outer Limits episode “A stitch in Time”? With Michelle Forbes? I might do something like that.
Though if I wanted to do some time traveling that DIDN’T involve crazed vigilante actions, it might be fun to watch to Apollo 11 launch (I’m guessing it’ll be a while before I’d get a chance to watch a rocket THAT big launch again), and the moon landing.
…Or just go back to 1995 and tell my younger self (Heck, the rest of my family too. I’m sure they can keep a secret.) to invest in Amazon.com when it goes public. And, more importantly, when to SELL Amazon.com stock.
Established Timelines…who needs 'em? 
Ranchoth
(Or I could go back and use an odd-caliber pistol to assassinate a freelance weapons designer before he can complete a superweapon for the Iraqis…Nah, too unbelievable)
I’d go back a couple of thousand years so I could try to hook up with a certain sweet young virgin…
(am I going to hell for that or what?)
April 1865 for the joy of the bloodbath being over, and the crushing saddness over the death of our greatest President.
Are we talking recorded history or history of the universe? Because I’m thinking the first month of time would be fairly telling in terms of how everything got started:D
I would do the second month of my Primary Flight Training at Rankin Aeronautical Academy, Tulare, CA. in Nov-Dec 1943 over, and over and over.
Open cockpit biplanes, helmet, goggles, leather jackets - and we had soloed so there was no instructor, most of the time, to bang your ear. What an enjoyable month that was!
And the people in Tulare were great. Every Saturday night they put on a community dance and all the girls came down to dance with the Aviation Cadet heroes who were preparing to save the world from the dirty Krauts and Japs (apologies for the derogatory phraseology, but that was the jargon of the day).
I agree with samclem, I’d like to go back to Washington for August 1974. If people thought Berlin was joyous after the wall came down, imagine what DC would be like after kicking that scumbag out. I’d like to be at DNC headquarters for the resignation speech, and I bet the parties would be awesome.
Ech, toughy. The Berlin Wall sounds really nice - I’ve seen videos of the dancing in the streets and overall joyful atmosphere in Berlin after the Wall collapsed, and I’d have loved to be a part of it. Besides, my German needs practice.
Or, if I’m feeling like playing hardball with causuality, I’d stop the Archduke Ferdinand’s assassin attempt before he could set the ball rolling for World War I, which set up World War II, the collapse of the British Empire, the Cold War - a whole slew of world-shaking events. Since I really have no clue how the world would turn out, I might be messing up a lot. But it’s worth a try, at least.
Save the world, or party in Berlin. Toughy, like I said.
The second week of November through the second week of December, 1954, to see how McCarthy went down.
The original Bastille Day, three days before to 26 days after.
The 30 days preceding the point of 15 seconds prior to the asteroid strike that ended the Dinosaur age.
any 30 days that would include the rounding of the horn on the Flying Cloud’s record run.
Any 30 days being Ernie Ghans co-pilot.