Barcelona - Sagrada Familia (purchase tickets online prior to going or go with a group tour); Park Guell; Take the Hop-on, Hop-off bus to access a variety of wonderful features of Barcelona). Since we had been to Barcelona before, we found a Paella class (hands-on) which was a lot of fun.
Athens - The Acropolis, but make sure you take great walking shoes as you climb up old stone steps and can be crowded. (Also went to Mykonos but found that underwhelming).
Rick Steves is a great resource, and also look at posts on Trip Advisor for additional suggestions. We booked a private tour for the Amalfi Coast that was spectacular as well as other smaller tours found through Viator (sometimes ship tours are very crowded). Great experiences on all tours booked through Viator (Turkey).
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