Volcanology
The regions North of the Yukon River, all the way to the Arctic, are the worst for mosquitos in general. The worst time of year to go is in July, however you are likely to encounter them as soon temperatures remain above freezing for a couple of weeks.
You can bring repellant, but the stuff that repels the best is bad for your skin and clothes, and will contain a measured amount of deet. Since I personally prefer to not to crop dust myself, you can purchase netting to go around your hat or head, and maintain long sleeves and pants throughout the day.
If you still get bit, don't scratch!
Not sure when you're leaving. If you e-mail me your address, at [email protected], I will send you a complimentary copy of the Yosemite National Park Guide. Are there any others you would like?
Happy trails!
-Brigitte @ Morsel Munk
We haven't heard of any links, but that doesn't mean there isn't a relation between the two!
For more information, you can check out the liks below:
Fishing license requirements vary from park to park. State fishing laws apply, and some parks have their own regulations, so it's best to contact the park you plan to visit before your trip.
Im not that familiar with the actual Ranger led hikes, since I tend to set out on my own or with a fellow employee or two.
I recommend the Total Yellowstone Page's hiking section:
http://www.yellowstone-natl-park.com/hiking.htm
Hikes are broken down into Day Hikes and Longer Hikes, and descriptions are given for most of the trails.
Also, stop in the visitor center at the location you're based at (Canyon, Old Faithful and Mammoth have the best centers) and see what the Rangers themselves have to say.