Saw it from 3 miles away
I plopped for the "feel the heat" package for $230 which meant you got bussed to the Saturn V center, about 3 miles from the pad and 9 miles from the landing zones. We stopped on the way at the Shuttle Landing Facility to see the plaque where Atlantis rolled to a stop in 2011 at the end of the last Shuttle mission. That was unexpected. The 4.5km long 100m wide strip is a huge piece of tarmac.
Anyway, there were no winds locally, they were all high-altitude and you could see wisps of clouds skidding over. It was a beautiful perfect Florida day. Sunny, 78F and barely any clouds.
Bill Nye was there to stump for people to join The Planetary Society. He's actually got a nice sense of humor.
Most of us figured there was about a 30% chance it would launch, and we were wasting our time. People didn't think it would go "boom" but they also realized most "first" launches get scrubbed 2 or 3 times.
If you think the SpaceX people were cheering and yelling, they didn't have nuthin' on this crowd. When they announced fueling start, people went nuts. When they announced "go" for the launch at 3pm, people went nuts.
We got to hear the SpaceX webcast without the usual 10 second delay.
It was REALLY LOUD. AND BRIGHT. It was welding-torch bright. And yes, we were warned to stay away from the Saturn V center glass windows, which was a good idea as you could hear the entire building shaking at launch from 100 feet away. Of course you were shaking too. Megadeth & AC/DC only wish they could get a bass rumble that deep and loud.
You could see the boosters fall away, then they were two bright dots overhead for the re-entry burn, then they fell some more, and finally they did that synchronized science-fiction landing just to the left of the VAB, from where we were sitting. Just amazing. You couldn't script something that looked so much like a '50s sci-fi movie.
Just after they landed, there was the 4 sonic booms BAM-BAM, BAM-BAM, and then the rumble of the landing rockets, as the sound finally got to us.
Afterwards, we got a complementary champagne toast in a nice glass keepsake that says "Falcon Heavy Test Mission 2018", and a SpaceX Falcon Heavy hat, and a red "Falcon Heavy: I was there" t-shirt. So it was literally "been there, got the t-shirt"
Worth every nickle.