Size, buildings and dungeons are something at the top of his list... and especially with my current height of 19'9". Currently that means alot of crawling through doors and slouching against a wall in a corner to be in a room with the party... god help me if a fight breaks out.. drawing most weapons would be completely out and I'd assuming I'd be at serious penalty to any OB/DB maneuvers. GMs says I'll probably have as many concussions as the rest of the party combined if not more because of my size and my society background.
Critical and Attack tables(offensive and defense) were the first thing on my question list to the GM and he is trying to sort through that... any suggestions for him I'm sure he'd appreciate. While there are rules for converting NPC races to PC, they really aren't designed with giants in mind.
Standard doors (now) are about 7' tall and 3' wide on average. Average ceilings in a building are about 8' high. (note: in the past, at least in many older houses that I have seen, doors often tended to be not quite as wide as modern ones).
A 6' man is about 2' wide if you measure him from side to side when standing still.
a 19'9" tall giant is quite going to be 4.5' to 6' wide from side to side, just guesstimating - using the same basic proportions.
What this means is that he will unlikely fit through many door, period. That would be the equivalent of a full grown man trying to fit through a door that is 2' tall and only 1' wide (think of a large doggie flap in a door).
And IF you got inside, you would have to most likely crawl everywhere, forget walking on your knees (a normal person's knees are about 18" above the ground, so your giant's knees would be about 5' off the ground (making him 14' tall when on his knees)).
Even if crawling, he would still be about 6'-7' tall, possibly taller in the front depending upon arm length. And still 5' or 6' in width....
Also, since you have said going into town is problematic, that means you have to trust the party to buy your supplies. The sheer volume for what you need will require a wagon, at the very least...
A little googling reveals that an average person needs about 5 lbs of food per day. A giant of your size, would likely need the equivalent of about 20-30 lbs of food per day (and I think that I am guesstimating on the low side here, it may be as high as 50 lbs a day).
Youch!! No wonder Giants mostly just run around and steal from others, they are just trying to survive... hehe