Here is what I found, courtesy of my oldest city on EN1:
Flower Float 23% Elven Float 10%
35 KPs 37% 8x8hr time instants 30%
Balloon/Dragon 13% Glossy Garden 10%
5x10KP instant 43% 2 Spectral Stone 33%
Glossy Garden 17% 35 KPs 43%
4xLM 10 unit refill 30% 500 Diamonds 10%
4xSmallest Room 13% Flourishing Nut Cave 13%
5x10KP instant 50% 4xLR unit refill 23%
Observatory 10% 5x10KP instant 43%
12x5hr instant 37% 500 Diamonds 10%
Mother Dragon 17% Balloon Dragon 10%
35KPs 43% 8x8hr instant 38%
4xSmallest Room 17% Mermaid Shell 17%
5x10KP instant 40% 12x5hr instant 27%
Observatory 23% 35KPs 47%
500 Diamonds 20% 3xSpectral Stone 10%
Clam Cliffs 20% Flower Float 10%
35KPs 37% 12x5hr instant 33%
Elven Float 17% 5x10KP instant 47%
500 Diamonds 20% 4xmage10 unit refill 17%
Edit: I won 35KPs, Glossy Garden, 5x10KP, Observatory, 8x8hr, 12x5hr, 500 Diamonds, 35KPs, Elven Float.