Personally? Dragon and Panda deserve multiple attractions.
Dragon
- Family inverted
- Slow boat (themed to Viking ship) where guests go from Berk (city, training arena, valley) to one of the dragon islands in search for one of the tertiary characters. Think ET, structurally, at a grander scale
- Dumbo spinner themed to a dragon nursery
- "Thrilling" dark ride featuring a battle for Berk (added later)
Panda
- Family coaster
- "Journey of the Dragon Warrior" omnimover that retells the first movie
- Teacup spinner themed to Ping's Noodle House
- Stunt-show
There's a quarter of your park right there.