BCN is Awesome, plus 2-hour train gets you to wineries! easy non-stop flights from MIA (really burnt I missed the $300 AA flight)
LIS is a dream but unlike BCN, no real kosher. Enjoyed Macabbi and Shakshuk at BCN. you can always skip over to Ibiza or Palma de malorca
However, no visit to spain is complete without going to his holiness, ari shebagola, cohen hagadol m'echav, ha-mekubal etc etc the Admor of Malta Shlita Grand Wzard of the holy order of Light