I'm glad you brought up Clarks DB, and in this context too. I've been thinking about them recently (never owned a pair) on the basis that they might be the best warm-weather travel shoe. I like to pack light, so if I can get away with only bringing one pair of shoes (and maybe sandals or espadrilles for the beach/pool), that's what I want to do. Thinking about Costa Rica, some Clarks DB in suede would have been perfect, I suppose except for the part when it rained. But they're not that expensive, so if they get a bit beaten up (or stolen in Ibiza, or whatever), it wouldn't be a big deal; I wouldn't be ruining a pair of Aldens (which I also considered -- the suede chukka). Also the crepe sole is probably better for stomping around third world country terrain than an Alden leather sole anyway.
My alternatives would be the MMM GATs and CPs I already have. The CPs are pretty good for a day's worth of walking but the MMMs, while more comfortable initially, don't hold up all day long.
Talk me out of it? I know Clarks DB were really popular on the forum sometime around 2008 and have largely fallen out of favor since, and they're "imperialist rapist boots" and whatever, but I think they probably fit with the rest of what I wear and might just be the most versatile shoe for my warm-weather vacationing.
Get some. They will be exactly as you described. Comfortable, lightweight, inexpensive and easy to mix in w/ (what I know of) your travel wardrobe. Plus they work well sockless (for the most part.) Only real drawbacks are crepe sole/suede combo sucks in the rain and they aren't the most ankle supportive/traction granting set-up, so if "hiking" means real dirt trails, rock scrambling, etc, they may fall short. If it means exploring cobbled streets, dirt paths to the beach, markets and what not, they'll be fine.
No one wants to thrash/lose/have stolen a pair of expensive shoes, whether they are Alden or MMM or whatever. DB's fir the bill perfectly.