Welcome to the forum.
What you would consider too much?
It's probably one of the better lenses in it's class...which is cheap consumer level zoom lenses. The maximum aperture is not very big, so getting fast enough shutter speeds in lower lighting may be a challenge. This can be overcome with the use of a tripod or other form of support.
If you can spend more, there is a version with Image Stabilization (IS). This will help you get sharper images while hand holding the camera & lens. Although it won't help freeze the action of moving subjects.
You may have to use faster film (ISO 400 or 800) but that will mean more film grain will be seen.
A really good lens would be the 100-400 IS L....but it's quite expensive.
I went to Costa Rica last year and this is what I did for a super telephoto. I used my 100-300 Vivitar lens (not a great lens) and also used a Tamron 2X teleconverter. That essentially made the lens 200-600. Although, a teleconverter steals light (about 2 stops for a 2x)...the result was that autofocus did not work...so I had to manual focus when using this combination.