Take your time and don't forget...,

[Silverobama]

Thomas and I are friends and we both go to the mountains in summer. A few weeks ago, he told me he would go there and wanted to meet me there. Last night I asked him when and he said he and his wife haven't decided yet but they would surely go there. I then said to him:

Take your time and don't forget to let me know you decide when to go there.

I don't think it's natural. Could you please help me with a natural version,.