Inspired by a set of microcoasters made by someone else (linked here: http://imgur.com/gallery/mdHaj), I set out to make my own! Currently I've made ten of them, including a reverser, side-friction, wooden, mini, corkscrew, giga, inverted hairpin, twister, Virginia reel, and junior, and none have an excitement rating below 4.40. They're all pretty solid rides and generally are slightly cheaper due to their small footprint and short lengths, though the longer trains are better due to throughput. All of them are 10x10, with the exception of the twister coaster, Ninety Looper, named for the space it occupies: ninety spaces.
All ratings are approximate and may vary slightly.
Switcheroo (reverser)
Excitement: 5.00 (Medium)
Intensity: 5.00 (Medium)
Nausea: 3.90 (Medium)
Knight Watch (side-friction)
Excitement: 4.40 (Medium)
Intensity: 5.50 (High)
Nausea: 3.00 (Medium)
Bitty Looper (wooden)
Excitement: 6.50 (High)
Intensity: 6.80 (High)
Nausea: 4.10 (Medium)
Jet Coaster (mini)
Excitement: 5.20 (High)
Intensity: 5.50 (High)
Nausea: 4.00 (Medium)
Thaw (corkscrew)
Excitement: 5.20 (High)
Intensity: 6.20 (High)
Nausea: 2.50 (Low)
Triangulator (giga)
Excitement: 7.20 (High)
Intensity: 4.40 (Medium)
Nausea: 2.50 (Low)
Treeway (inverted hairpin)
Excitement: 7.40 (High)
Intensity: 8.90 (Very high)
Nausea: 5.28 (High)
Ninety Looper (twister)
Excitement: 6.10 (High)
Intensity: 4.60 (Medium)
Nausea: 2.70 (Low)
Cassette (VA reel)
Excitement: 5.40 (High)
Intensity: 5.00 (Medium)
Nausea: 5.50 (High)
Junior Jr. (junior)
Excitement: 4.90 (Medium)
Intensity: 5.40 (High)
Nausea: 3.50 (Medium)
Every ride's path meets at ground level and every ride fits in a 10x10 space including queue and exit paths, as well as scenery. Let me know what you think, tell me what could be improved, and take a look at these rides in this save. I encourage you to try your hand at making some of these - I really enjoyed making the ones I did, and I'll likely make more.