I tried finding a partner to work with, but that's pretty much impossible in Silicon Valley where I live. Most good engineers want to work for one of the glamorous companies in the Valley. Oh well...
I've been working on Jollyturns for the past 5 years. It's been a lot of work, but I do it at my own pace since I still want to enjoy myself. The experience is unique. I write all the software myself, and hired few people to help map the ski resorts. I built a bunch of custom tools for the mapping work, so people can map the location of lifts, ski runs, restaurants inside a ski resort. I ended up having mapped all the ski resorts in the world, about 2700 of them.
Writing the code is the easy part. I found marketing to be the hardest. You need to find a way to make the world know what you built, and that's hard!
Have you tried to reach out to any of your local resorts with a marketing plan? I'm sure they'd love some integration into your app for trade: you promote them, they promote you.