I came up with a wish-list, seems a little farfetched but I put in a lot of thought into it:
Leg 1 : Juneau, USA to Vladivostok, Russia: [CONTINUING RACING]
2 RBs, one related to height and one involving some form of a water sport (as it is very cold over there it would be tough for the contestants to endure the frigid temperatures.) Starting line task can be something similar to the s23 finale. There can be one 'lost in translation task' which involves Cyrillic and Russian.
Leg 2 : Vladivostok, Russia: [ELIM 11]
One task related to ice fishing, and the preparation of ukha. One task in defrosting and shoveling away snow (Combine the latter and the former for a detour?). One roadblock in Russian military (golden horn harbour!) and if there is a paucity then some extreme Russian sport like tank biathlon (just for fun.)
Leg 3 : Vladivostok, Russia to Kyoto prefecture + Osaka, Japan: [ELIM 10]
One task related to ramen (showing the next location inside the ramen box?). One task related to japanese crafts and arts, another task involving the Japanese art of incense sticks. Possibly a RB at Namba Grand Kagetsu !! 'needle in the haystack' type of task at sanjusangendo??
Leg 4 : Osaka, Japan to Wellington, New Zealand: [ELIM 9]
Navigation based tasks on hills in wellington; task related to the hobbit because of Weta caves, and another task involving sign language (NZSL For the win!!). Then a task based on the haka, perhaps?
Leg 5 : Rotorua, New Zealand: [ELIM 8]
A generic adventure based leg mostly revolving on physically demanding tasks. a shweeb race, bungee jumping, skydiving, scree runs, whitewater rafting, ziplines and skyline luges! New Zealand is a adventure junkie haven and I think that any one of these tasks can also be a FF.
Leg 6 : Rotorua, New Zealand to Cochin, India: [NON ELIM + UTURNx2]
A task involving the absurd popularity of coconut fibres in Kerala, another agrarian task (these 2 could be a detour). The participants can run the leg in traditional Malayali attire, and there can also be a detour on some martial art or a dance (both of which are known to be fast paced).
Leg 7 : Mumbai, India: [ELIM 7 + UTURN]
A fast paced city type leg, one task involving distributing lunchboxes (dabbawalas in Mumbai look em' up). A dance related task, and a culinary task. Then perhaps a crude oil task (mumbai high) or some beach related tasks.
Leg 8 : Mumbai, India to Dubrovnik, Croatia: [ELIM 6]
Tasks related to wine, kayaking, basically generic tourist activities in dubrovnik. Another task possibly related to GoT ? xD just kidding. some tasks involving searching the walls of dubrovnik, and perhaps making medicines in the Franciscan Church and monastery.
Leg 9 : Dubrovnik, Croatia to Dublin, Ireland: [ELIM 5]
Dance related tasks, a FF involving teams balancing upon balancing upon rolling barrels. Irish culture related tasks, maybe and of course one technological task.
Leg 10 : Dublin, Ireland to abidjan, cote'd'ivoire: [NON ELIM]
Task related to chocolate, task related to the rally cote'd'ivoire, and some rural challenges. I don't know, I had gotten dry by this point.
Leg 11 : Abidjan, Cote'd'Ivoire to Montevideo, Uruguay: [ELIM 4 + UTURNx2]
I don't know, really I was tired and I couldn't think of anything
I thought of some gaucho related tasks and some surfing tasks and challenges; also some task related to music or the national instrument.
Leg 12 : Montevideo, Uruguay to Austin, Texas.
THERE YOU HAVE IT! the race expands over 6 continents so a majority of the Earth is covered. It's flawed, what do y'all think?