Navala vs. Koroyanitu National Heritage Park

Hi,

I'm having only 6 days in Fiji at the end of November. I'm thinking of taking 5 days for islands and one day in Viti Levu. The problem is to choose between Navala and Koroyanitu National Heritage Park... Both seem very interesting. I'm into hiking but I am thinking that in case of bad weather Navalu would be a safer choice, and people seem to recommend it.
I'd appreciate help with the decision-making :) Thanks a lot in advance!