I'd dump strength and constitution and prioritize dexterity and charisma. You want to take rogue or bard, and do whatever you can to avoid combat, so using stealth or persuasion/deception. Sprinkle some stat points in wisdom and intelligence for some observational abilities. Make sure you take stealth, persuasion, and deception. Whatever makes you sneaky or able to get out of a fight is what you want.
