Guidance before you get here is best received from your predecessor. Any gift that reflects your own culture or hometown will surely be appreciated. But if you are in doubt, alcohol. They really love it here. And you may have difficulties with sizes.
Bikes can be frustratingly small.
On the other hand, it's stupid to bring a big bulky sports item if you don't use it. Perhaps wait until you get here, and if you think you want something, have it sent to you. No, wait, you forgot to mention skis and bikes. You can rent skis boots up to size 28 and skis up to around 210 cm. That's cheaper than what I could have shipped it here myself.