My personal favorite is raft guide in summers and ski instruct in winters.
Is this easy to get into? Particularly the raft guiding. Something I've always wanted to do when I'm done caring about how much I take home.
Raft guiding in the US is pretty darn easy to get into. In most states, you just have to have CPR/First Aid certifications and show up for a guide training program. On the East coast, guide training is ~4-6 weekends in March or April or May, on the west coast and rockies its usually 1-2 weeks straight in early April.
Usually it is pretty darn hard to make much money your first year as a guide for a couple reasons.
1. Some companies make you work to pay off the training fees.
2. You need to get a minimum number of trips on a river to be certified in that state. This limits the number of trips you can get paid for in one season.
3. You need to buy some minimum amount of gear. (helmet, life jacket, throw rope, clothes)
My first year, I lived in a tent, and customer tips paid for food and beer and at the end of the season, I had enough money saved up to buy some gear and a kayak and that was it. PM me if you want to know more.