We have just returned from a holiday in Ibiza with our DS who turned one while we were away. The hotel was great, very friendly staff etc, great location.
One thing that let the hotel down was there highchairs. Plenty of them and very nice 'Ikea' style wooden ones but no safety harness at all. DS spent 2 weeks trying to climb out of it and succeeded most days! So if you're going abroad (or anywhere) maybe squeeze in a harness or some reins or some other form of restraint for your peace of mind.
ps. Our hotel (classic package holiday type) had black out blinds at the bedroom windows. A nice touch.