I would want to go back to Maine in the mid 1700's to see what my ancestor's looked like, and to ask the questions I can't find the answers to, like..............what was your father's name, your mother's name, where did you come from before you went to Ireland to sail to America????, etc. etc.
I wouldn't want to stay. Life was too hard, Maine was too cold in the Winters, they couldn't stay clean, and there were hostile Indians in the region. My furthest back ancestor was almost captured by Indians when he was 14. His friend was taken and they sold him to the French in Canada.