i had a 70 1/2 camaro that was a load of fun when i was younger. got married and we bought an 89 240sx. both were fun in different ways, one went fast in a line and one went fast sideways!
Fastest was my college car - 69 Torino GT Fastback with a 428 CobraJet engine + 4 speed; no AC, power steering, power prakes, etc. Just AM radio, stering wheel, bench seat & heater. It got 8 mph on premium gas but nobody cared back then. Probably the most fun for cruising was my 1980 Trans Am in Smokey & the Bandit black & gold. I lived in Broken Bow and would take the t-tops off in the spring & summer to go cruise the lake and Beavers' Bend and go over Kiamichi Mountain with Willie Nelson or the Bee Gee's playing on the 8 Track.
Probably the most fun car was a buddy's 05 vette. The most fun time was when that same buddy and I were on lunch during college. His dad had a 2000 vette with active handling. **** you not 53mph 90 degree turns. It was ridiculous. Still want a vette.......
Mine would have to be my Honda prelude 4ws(4 wheel steering). It wasn't the fastest car I have ever driven, but it had amazing handling. Tires turned the same direction at high speeds for zero body roll lane changes and turned opposite of each other at low speeds under 45. It would make a perfect 90 degree turn at 40 with no body roll. It was a lot of fun.
Also had a 86 Toyota pickup 4x4 that I loved off roading and pulling people out of the snow in. It was a beater, but would go anywhere.
Nothing fancy, but they were fun to drive.
Nicest car I've driven is Audi A6 3.0T supercharged and Porsche panamara.