Hello Shaz
Well done on taking the plunge!
I returned from this holiday yesterday so everything is fresh in my memory! With regards to the optional extras, the cliffhanger lunch offers a superb view of the lake from high up in the mountains. On the way back, our tour guide took us to a delightful village called Limone which is also situated on the lake and offers stunning views from its port.
I felt the Siguara gardens were more a giant park - to give you an idea of its size it takes 30 minutes on a noddy train to get round it - in addition it is situated high in the hills and so offers great views from its borders of the surrounding countryside. Only you can decide whether these trips would appeal to you but personally I'm glad I did them.
Hope this helps, feel free to ask me anything else about this trip.
Michael.