I think this depends on where you go. Certain vacation areas point you more towards one or the other. Most beach going vacations tend to do things to keep you on their resort and to simply lounge around. Others promote things like hiking, kayaking, white water rafting, etc.
My personal preference is to explore. I live in south Louisiana where there isn't much to explore besides swamp. I love to go north and visit areas with hills and hiking trails and streams.