Stanbr & I are a Tag Team ... I'll take up the challenge for the post-Naxos itinerary
As I said above, "nights" is self-deceiving. You say 4 nights Naxos... but u arrive 5:30pm won't be into room, changed & ready to leave hotel til nearly dinner... and if yo u leave @ 10 am flight April 25 you have only spent 3 days in Naxos, largest isle of the Cyclades. I would suggest you add a day to Naxos -- postpone that AM flight until April 26 th. (Even if you already booked, to make that sale deadline, u should be able to tweak the date without any penalty).
THen the challenge becomes, how to fit everything in to the 3.5 days at most, before the 3 days that AThens deserves. To help decisions, here's online map i love - https://tinyurl.com/zekuft9 (click & it gets huuuge - navigate w side-slides). It shows all roads -- right from Airport, all of Pelopponese, PLUS part of road heading up toward Delphi. Shows all other sites u name.
The "wish list" is too long for mainland sites .... 4 "day trips" in 4 "nights", now 3.... & doesn't count at least a day to experience gorgeous Nafplio. How about reading, not just online pix. Have a guidebook? Toronto has fine libraries... borrow an armload. Then sit down with each other & discuss: Is something on list because famous, or because it truly intrigues you? Is it a place you can understand & appreciate on your own, or would you need a licensed guide (@ €60 hr, 2hr min)? What if a place requires 5 hours extra driving? Don't get me wrong - these are ALL wonderful. But people on forums who recommend seeing all, often have 2-3 weeks in Greece or else (like me) divide them up, see some now, and some on later trips. Some things to consider for each:
CORINTH - Can take over 1/2 day; For some Christian denominations, Ancient Corinth is vital for st Paul preaching there; Acrocorinth high peak has stunning views (but consider, Palamidi Fortress looming over Corinth, just as stunning). Maybe save Corinth for next trip?
MYCENAE - Huge Iliad-era hilltop ruins & Museum (visit it first, for visual grasp via models) - if v. short on time, consider instead a stop at TIRYNS, just outside Nafplio, Same Huge Boulders (even bigger), unrestored, no museum, almost no visitors.
NAFPLIO -- stunning architectural beauty, history, winding car-free lanes. Use this fab website - http://www.visitnafplio.com/ ... click every link! Elevator INSIDE a cliff to reach Akronafplia, superb museum on town square, Palamidi (dont do steps, drive up back way) .. great walks plus good dining in small tavernas, and BEST mainland sunsets.
EPIDAURUS -- no need to drive there & then return to NAfplio. Avoid backtracking - instead, visit it enroute back to Athens Airport. How? LEave Nafplio Old Town, drive EAST across Peloponnese "thumb" (see map!) to Ancient Site.. Don't get lost in ruins-rubble, it's mainly about awesome 15,000 seat stadium. After, drive up COAST road to "Isthmus." then u can walk out on Old Bridge & see Corinth Canal before getting back on the big Intercity Highway.
DELPHI - u will have to decide... to get there you'd need to exit N @ Elefsina, turn NW at Thiva (thebes) another 2 hrs to Delphi - April closing time may be 4 pm; wd have to stay o-nite. If on Day 1, u left Airport @ noon, u still wouldnt reach delphi before 3pm. Something to consider.
A PS -- on outbound leg, after crossing Corinth Canal, about 15 miles on is a really Fun Quick stop for an overlooked Gem.. Ancient NEMEA. This was the "runner-up Sacred Games Site" to Olympia ... has some ruin, huge columns, and, a thousand yards away, an amazing stadium. Only excavated & lovingly repaired in recent times; u can walk thru "heroes tunnel" & Crouch at starting blocks that are 2500 yrs old. Academics &local Greeks combined to launch a Revived Nemean Games ... now every 4 years, thousands gather to compete in traditional garb, run, win laurel crowns. If u skip museum u can be in/out in an hour.
