eat, drink and be merry
get down
live it up
have a good time
have a ball
sans-souci
go bonkers
never fear
worryless
angstless
let oneself go
have fun
undetesting
let one's hair down
have a whale of a time
have a laugh
nil desperandum
vibe
forbear
fear not
hold back
not have a care in the world
undisillusioned
hold one's fire
don't drive faster than your guardian angel can fly
relax
loosen up
unbend
slow down
do justice
go large
unwind
decompress
undisinterested
in the moment
nondisinterested
go nuts
recreate
seize the day
exit stage left
kick up one's heels
let it all hang out
unlachrymose
uncaring
spare
diverting
heedlessly
rest
amusing
amusive