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What to get my Dad’s girlfriend for her birthday?

I am close to my Dad's girlfriend and she always gets me a birthday gift. I would like to get her something but I don't know what to get.
She is in her 50's and likes home decorating (especially making things look like Pottery Barn with things she finds a discount stores), She does consultant work for hospitals. She also recently bought a pontoon boat so it would be cool to get her something she can use on that. Her house is by the river and she loves to have family over for get-togethers. She also likes hiking, biking and being outdoors.
I am a teenager and would like to spend about $25 or less. Any suggestions on what to get her?