My husband and I will be visiting Paris for the first time in early January. Since this is our first trip, we were thinking of taking the hop on hop off bus tour to familiarize ourselves with the city. However, after reading reviews, it appears that a lot of people didn't have the best experience with these tours, and it seems like it might not be the best option with the cold (and possibly rainy) weather at this time of year. My Rick Steve's guidebook outlines a self guided walking tour. Would this (as well as using the metro) be a better option? Thank you!