Some equipment you may need to make a close up on what you want to watch. Birdwatchers coming down to Costa Rica, should keep in mind that they are going into the rainforest, and will need waterproof equipment and plenty of ziploc bags and rainwear.

Swarovski SLC 10x42WB
These are wonderful binoculars, with impeccable optical qualities: waterproof, nitrogen purged, nitrogen filled, phase corrected.

Nikon Venturer LX Binoculars 10x42
One of the very few 10-power binoculars that lets people who lets people who wear glasses see the whole picture.
The focus knob is absolutely silky, a pleasure to turn. The resolution, clarity, and contrast are as good as it gets.

Leica Ultravid 10x42 BR
Nothing beats a Leica for brightness and resolution. The new Ultravid, however, has beaten all previous Leicas. This one has rubber armoring.

Pentax DCF SP 8x43
This new waterproof binocular is one that we believe will become a great favorite of birdwatchers. On our tests it proved to be a very nice sharp binocular, for half of what the "top" binoculars cost.
Outstanding eye relief of 22mm means everyone including people who wear glasses can see the whole field of view (no "tunnel vision"). And it focuses as close as 6'6". The field of view at 1000 yards is 330 feet.
This is a full-size binocular, with objective lenses 43mm wide, but it weighs only 24.5 oz.
All the DCF SP models are housed in a nitrogen-filled magnesium-alloy waterproof body (JIS Class 6) and protected with a full-body rubber housing.
We loved the small detail of objective-lens covers that are attached so that you'll never lose them. Comes with strap and Cordura case.

Zeiss 42 FL T* binocular 7x42
This binocular is as close as it gets to pure magic. A sublimely bright, clear, pure picture.
Weighs only 26.6 oz. Dimensions: 6.45x5.4 in. Eye relief 16mm. Field of view at 1000 yds. is a wonderful 450 ft.
Twist-out eyecups are easy to adjust to precisely the degree of eye relief that works for you. Of course, like all Zeiss binoculars, it's waterproof, nitrogen purged, and phase corrected.
Comes with cordura case, strap, rainguard, objective lens covers and Zeiss lifetime transferable warranty.