I think that Gimli took the Elf road through Mirkwood and didn't go around. After the war on Erebor the Elves seemed to be a little friendlier with the Dwarves. Moreover, Elrond said that all the members of the counsil came at aproximately thin same time, so it's very possible that Legolas and Gimli traveled together. It is also possible that Gloin took the same way back and brought the news about Legolas' choice to Thranduil.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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