There are many lavender farm in Furano, but Tomita Farm is the most famous one. You can see many another flowers with beautiful color beside lavender (of course lavender is the main purpose though).
You can also buy some original souvenir that made from lavender in here such as parfumes, soap, candle, aromateraphy etc.
If you drive, make your way towards the Rokugo area. Along the way, you can stop at family owned ramen shops, glass ware factories before finally reaching the Anpanman shop and jam factory situated right at the end of a non-through road.
The jam factory is a little disappointing since it is actually a small shop selling a variety of home made fruit and vegetable jams. Good thing is - the Anpanman shop (which sells related toys and peripherals) is right beside it and there are 2 other glass factories selling pretty glassware along the way.
Must try are the ramen shops along the way - they sell good rustic meals at below average prices.
This is a little out of the way but is situated right beside the Furano Prince Hotel. Shops built entirely of wood and wedged artfully amongst a forest sends out a mysterious air especially in the rainy evening. You can find unique items like whistles made out of wood and metal works.
Go in the evening when the "mini forest" is lit up and all the more beautiful.
Lavender products such as scent pouches, pillows (for that restful night), cut flowers, potted plants, tea, sweets and other accessories are the local specialty of the region.
Even if you do not intend to buy anything, it's interesting to look through all the products on sale - most of them beautifully packaged and too cute to resist.