Please learn a tiny bit of Japanese!
Yokosuka locals are some of the best people you will meet. You just have to get past the shell which can be difficult sometimes. My mother is Japanese so it's a little bit easier for me to understand how they keep people at bay and try not to be the nail that sticks out. Be an example of goodness and they will accept you and not think so poorly of Americans who live there or foreigners who visit. I found that if I used my limited Japanese to try to communicate, it went over so well and made the Japanese locals so happy. I have a well-worn translation guide that I carried with me everywhere and I had the most fun just leafing through and finding phrases I needed or showing the folks I was talking to the Kanji/Kana/Hiragana translation. I miss the fun of trying to communicate! I miss everything from Yokosuka except for some of the ignorant Americans who would cause a scene because they didn't understand Japanese. Get educated!