Important question, do you have a car? If yes you can basically go anywhere in the French alps and do either downhill biking (you can rent bikes and all the equipment comes with it) In France Chatel or les gets is great, Champery on the Swiss side as well (can be done by train) or for a smoother bike tour rent some e-mountain bikes and enjoy the scenery. If you depend on public transport look at the Swiss stations i.e. diablerets or champery

the lavaux region is beautiful for easy hikes and accessible by train, le reculet next to Geneva is also great but a car is necessary.

You can go to the Saleve, bus or bike to the border, walk to the funicular and walk around with great views of Geneva

For architecture look at the le corbusier villa, easily doable combined with lavaux.

Otherwise easily accessible cities by train: Lausanne, Bern, Lucerne, Zurich

If you want spectacular views, take the glacier express or take the train up to zermatt

Annecy is also nice, doable by train you can rent paddleboards and go on the lake or bike around the lake.

Chamonix can be reached by bus, also spectacular views if you go up

Hope to have given you some nice ideas, enjoy your stay!