I got my tatoo on my shoulder.. right on the top side of my shoulder (not the back blade area).. It was the perfect spot for me because I can see my tatoo anytime I want, but it is easy to cover for professional needs with just a short sleeve top, and I can always show it off during the summer with tank tops, plus no wrinkle/stretching worry. The shoulder area is tougher and not as sensitive, so less painful. The inner calf would be a lot more sensitive because the skin is thinner, so this is something to think about.
I had a friend that had calf area tatoos and she bought boxes of large square band-aids to put on every day to cover them at work, but for me that would get old.
Tips:
Go to an fairly expensive tatoo place and look around first. If it looks very nice, sparkly clean, organized, go for it. I would also talk to the tatoo artists there and ask them how long they've been doing the work and go with the most experienced. Never go to a tatoo place because they're less expensive.
Be sure to eat a decent meal before getting your tatoo.. never go on an empty stomach or you'll likely pass out. I did by accident and I definitely passed out like a rock right after it was done! Lol.
Dont get tons of color, go for black with 1 color shade added.. colors fade faster than black.
You can also bring your design and ask the tatoo artists if they have any modification ideas for what you want.. most are very artisticly talented and can have some great ideas to add.