Having helped care for 3 (1 curl crested, 2 green), I will say you better have a hose and/or a steam cleaner on hand!
The ones I got to help care for had "toucan pellets" available to them 24/7 and were fed fresh fruits (and the occasional vegetable) twice a day! No citrus fruits, though!
Jason Crean has a lot of great information in regards to diet! He's got a feeding chart of foods to feed toucans! Makes it simple!
Toucans EmeraldForestBirds.com
Beaks Birdhouse Nutrition
MRCREAN.COM
Despite their small size, you *WILL* need either a walk in aviary *OR* a cage large enough to house either a large cockatoo or a macaw! They don't climb, they hop! So they need enough space that they can hop around to the various perches!
Care also needs to be taken on the type of toys one provides to toucans and aracaris. Toys with beads could be dangerous!
I heard that many toucans in zoos are often fed a cantaloupe based diet. The ones I helped care for had a papaya based diet most of the time...