I am heading to Spain this month too! Should be there by the 20th and leaving the 27th. I plan on bringing my Mamiya RB67 and my Canon (d)SLR. I have 6 rolls of 120 everything from 50 to 400 and two packs of Fuji Instant film! The Mamiya is going to be my "unobtrusive" camera and the dSLR is going to be for snapshots. (Funny how that works out huh).
I thought about bringing my Yashica TLR but I love the look, the feel, and the backs of my Mamiya and thats how I came to the decision to take it.
Have fun and if you end up on the Isla de Palma maybe we will run into each other.