The best map for DayZ is Namalsk, hands down. Small map, loot spawns are good and always interactions happening. Find the Blue, Red and Orange filimints and then the Blueprint on Tara, head to the sub and get the keycard then go to the oil rig and make a spacesuit
DayOne Namalsk servers (#1, #2, #3) are the best but always a queue unless you time it right on a restart. Zero have a good server too.
Not forgetting the EVR storms, then there is jumping through the orb to get to A3, from there you can get to Lantia through another orb.
Its just mind boggling what they did with that map since how DayZ was in the Early Access days.
And the in-game ambient music for Namalsk.. Bubson Records did a fine job!