Agree with
unterhausen on staying fueled.
Per
Calsun's point, I don't know about Mallorca weather (any time of the year but particularly in April). It's been said that "hot" is 10 degrees warmer than what you're used to; Mallorca may well be hot coming from Penna. that time of the year. What about climbing and water availability? You'll want to make sure to stay hydrated as well as fueled; the times I've run out of fluids, it usually takes me a couple hours of very slow riding to recover -- if the heat and climbing make recovery possible at all.
I assume you've got lights sorted out? It'd be wise to start planning on some time riding in the dark, just in case hills, heat, and time off the bike push you out of daylight.