I like the guest basket idea and also the chalk board. But all things are relative to your listing--what type of listing are your going for, what your rate is, etc. I don't allow 1 night stays but any listing, even an economical 1 night listing can do something special for guests that cost little to nothing if they choose. It would be great if there were some ideas/samples by room rate. Like rooms under $50/night, then other suggestions for rooms $51-100/night, then rooms that are $100-$150/night, $150+/night etc.
For example, even an econimical 1 night stay at a place under $50 can do something special. Fold their towels in a special design and add a personal message either on an index card or chalkboard. Ever wonder how to fold towels like a swan, fan, elephant, etc. You can learn how to do this free online so it only costs you time.
I provide a lot of access to full sized bath and beauty products which are labeled "for guest use" during their stay. I also provide a couple of bottles of sparking water, some cookies and fresh fruit like grapes on check in. This maybe costs me $5 per check in for a minimum 2 night stay. For stays of a week or more I also provide a bath pouf with a thank you tag on it that they can use during their stay and take with them when they leave.