I have a Canon Mark II and am traveling to Costa Rica for 10 days. If I want to travel light and only bring one lense what lense would you suggest I bring ?
The logical answer is whatever lens you're most comfortable with. Think perspective first and then weight. If it were me, I'd take a fast wide angle, like a 24mm (after the magnification factor) and a full range zoom.
The less equipment you take, the more (and maybe better) images you'll take.
If you're a MarkII owner and don't know what lens to bring, then you've got to much camera for your skill.
Try a point and shoot.
The thought has crossed my mind.