PinkBudgie, by rocket ride do you mean Astro Orbiter? If so, if I liked the ride experience of things like that (round and round in circles and no issue with heights), I would RATHER go on AO without a kid. It is so hard to get in and out of those things with a smallish kid! Hubby can't do it at all without feeling like an elephant, so he refuses to ride it anymore with our son (so I have to, yuck,

), even though he otherwise really really loves the ride.
If you have questions about squeezing yourself into things, DEFINITELY sit in the bench "cars" on Casey's. They are the comfiest things! Well, aside from the hard bench thing. Wide, generous space, very comfy.

And I adore Casey's! It goes much faster than you think they are going to go!
Since I don't like the round and round rides all that much, I personally wouldn't (and didn't) go on Dumbo and AO and Flik's Flyers on my solo trip (and I've never been on the Zephyr which just looks ghastly to me but DH and DS adored it), but if I did like those rides, I'd have gone on them alone.
The ONLY ride I would never go on alone, unless doing some sort of "rally" contest, would be the "bumper cars" in bug's land. Those are very difficult for an adult to fit into, and since I'm only 5'3" that's saying something.