Catch max in limited time mode
In this mode you have 50 seconds to catch as many as you can, and the rewards are dependent on the number you catch regardless of how long it took to do so. Catching all 23 the first time will award 200g and an ice cake; further successes only reward 200g. Catching 22 will award 30g and a holy water; further successes only reward 30g . Catching less than 22 bunnies will only reward a maximum of 9g, which isn't even enough to cover the entrance fee.
Catch ‘em all mode
In this mode you have 60 second to catch them all. The rewards are based on how long it takes you to catch every bunny. The gold amount will vary, rewarding up to 500g for a stellar run. Additionally, it is possible to win an XP egg the first time you complete it in under 50 seconds, and an ice cake for the first time you complete it in under 40 seconds. There does not appear to be a special prize for completing it in less than 30 seconds, but such a run is quite hard to accomplish.
Bunny Races
The bunny races you have to guess which ones will win the race. Just like in real animal races these bunnies are hard to predict who will win and which way they will go. If you win at least 3 out of 5 you will get 5000 gold to make up for all the gold you lost of betting on these silly things and 3x ice cakes. (Equip the luck ring on Random and bet primarily on bunny #2. For an investment of 40g, you'll be winning the 5000g reward often enough to make some good money here.)