I've taken my laptop almost every time I've gone to Ibiza. No problems.
If you're really concerned, get yourself one of those netbooks (Asus Eee series, Acer Aspire One, HP Mini, Samsung NC10). They have less powerful processors than regular notebooks but are ultra-portable, inexpensive (usually $500 or less), and small enough to fit in a hotel safe. They'll do just fine for web surfing, word processing, playing music and watching non-HD video.
I have a Fujitsu Lifebook U820 netbook. It's slightly more expensive than the others but has a touchscreen and is super-portable (fits in a coat pocket). I use it on short trips instead of my laptop, which lets me carry a camera bag on the plane instead of a regular full-sized laptop bag.