I also think you're setting up quite a bad comparison here. Why is it MDMA + sitting around vs. awesome stuff at Barcelona? How about actual experiences under MDMA vs. sitting in a hotel room in Barcelona? Ultimately MDMA just gives you energy and improves your mood. [1] Whether you decide to do anything interesting or sit around is based more on your character and less about whether you're under the influence of MDMA or not.
--
[1] MDMA is toxic at high doses and/or without rest. A good rule of thumb would be to not do it more than every two weeks.