They have lots there. I think a map is on their website which will help, but here's what I remember.
Cars that go around in a circle (like the carnival rides)
Boats that go around in a circle
Airplanes that go around in a circle and up and down
A little play area/playground
A train (uncovered)
A small roller coaster (I think it's 1 adult to 1 kid)
Carousel
Older Kid Stuff
Bumper cars (you would have to drive only 1 kid)
Log flume
Antique cars you drive
Scrambler
Water ride that you sit on the raft and go through tubes
Some ride that you sit in the car and it goes up and down
I seem to remember a problem with the roller coaster. There was a women with lots of little kids and they were requiring 1 adult to 1 kid. So keep that in mind with that ride. They had signs all over, but the woman didn't see them or ignored them and it was ugly when it was their turn to ride.
The food is pretty reasonably priced. I think a whole cheese pizza is like $12. They also have free fountain drinks, I don't know if it's just soda or if they have hi-c or lemonade.
You could do it alone if you just stuck to the little kid area and didn't do the roller coaster. It's not huge and the walking around shouldn't bother your older child. You could keep the other 2 in the stroller inbetween rides.
I went last year, so this is based on my (sketchy) memory of that.
M.