Princeville is wet. The wettest place on the planet is just up the hill from there. Rains 4 in. month in the dry months and up to 8 in the wet months.January is a wet month. Koloa and Poipu are not much different from Princeville in January, both about 7 inches for the month (or less than 1/4 inch per day). There is a reason it is called the Garden Isle ... it's wet.
I don't think that there is a "Bad" Island for a "first" visit.
Each Island has a different flower and slogan for a reason.
Each has a unique character, flavor and special features to explore.
We tend to favor Maui and Big Island in large part because the diving is better on those islands and we like to dive a LOT when we area there :ignore: While Kauai wasn't our first island to visit (we chose Maui) there is no reason for most people that it wouldn't be a good first trip island (unless you really like the nightlife). Be careful if you are thinking of making an only trip, because you may fall in love and have to go back.
We've been to Kauai twice and have enjoyed both visits. Had great Mahi Mahi Fish & Chips at a Bar and Grill in Kapaa. Had nice dives and Koloa Landing and Cannons. A nice sail trip up the Na Pali Coast. Spent 10 days watching whales jump in front of our lanai. Enjoyed the Grans Canyon of the Pacific. Explored the North Shore rain forests. Visited many secluded beaches. Checked out a Russian Fort. Shopped at farmers markets. Visited an art show.
Hope you get the idea. yo should enjoy exploring the Island. Like Jack said, get Kauai revealed. (hope that isn't an advertisement
We haven't yet been to an Island we didn't like and have been to most.