is it really necessary? Side effects (especially sun sensitivity) make me nervous about taking these drugs for a 2 day Tikal trip, and negatively affecting my week in AC after Tikal.

Also, know this is a princess-y question - but are trail running sneakers with treads/thick soles good enough? Have hiking boots, but they're hot, heavy and less comfortable - I'm trying to travel lite (carry-on), and priority is snorkeling equip/bathing suits!

Any input appreciated!