There are dozens of fishing charters, guided tours, flights, helicopter rides, glacier cruises, whale watching and other amazing experiences. A flight over the Juneau Icefield is worth every penny of the full price, but when you're on a budget even a fair price may be prohibitive. If they don't fill the boat or plane, they still go with empty seats. They are often happy to offer a last-minute discount to fill out the group. This is especially good with the smaller, cost-conscious operators.
Travelers come to Alaska with all levels of experience.
These tips hit on some main points, but by no means cover everything. Use common sense, ask when you need advice, and you'll leave with the trip of a lifetime under your belt.