We, a group of 15 friends will travel to Nagoya and surrounding like Numazu, Shizuoka, Hamamatsu, Minamichita-cho and back to Nagoya in 7 days for the month of June 2014. I went through all previous forum but can't find anyone travels to these places. I have done the search and found all these places to be of great interest and seafood. I would like to seek reviews from expertise in regards to these places. Since we are in a group of 15, is it advisable to travel by JR or rent 2 vehicles to move around to these places. Will it be cheaper to rent vehicles? Are road signs tourist friendly?