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быть в хорошем настроении stresses
gen.	be in full feather; be in high feather; in full feather; in high feather; feel good (Andrey Truhachev); be in high spirits (В.И.Макаров); be of good cheer; be in a good temper; be in good fig; have tail up; be in good spirits; be as fit as a fiddle; be in a good mood; be fine as a fiddle
Игорь Миг	be in a playful mood
amer.	be fine as a fiddle
austral., slang	chuck a willy
Makarov.	be fit as a fiddle; be in a cheerful mood; be in a good humour; be in good twig; be in high fig; be in prime twig; keep one's tail up
Makarov., amer.	be as fine as a fiddle
psychol.	be in a good state of mind (Alex_Odeychuk)

быть в хорошем настроении: 4 phrases in 3 subjects

American usage, not spelling	1
Makarov	1
Psychology	2