We stopped at this park on our way to Key West and took a walk on the Golden Orb loop trail (MM 68, 1.2 miles) as it was recommended by our guidebooks as a "must see" in the Keys. It's a fascinating and very worthwhile trail to do (quite easy too, no problem wearing just flipflops). Lots of interesting and unusual plant life, mangrove swamp, tropical hammock, as well as great views of the Atlantic ocean from the scenic beaches. We were there around noon, it was sunny with temperature in the 80s, so it was really hot. As most of the trail has no tree shade, better to cover up neck and shoulder area to not get burned (or use lots of sun block!), and bring plenty of drinking water (water fountain available at start of trail). Not very buggy, actually didn't get bitten by any insect – probably due to time of year (early April) and time of day. It was middle of the week so the trail was fairly deserted – think we saw about 10 people total including a few rangers during our leisurely hour-long walk.
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