To some extent, I think you are just going to have to accept and love them. If they are jiggly, then doing simple things like moving them as much as you can is going to firm them up - walking, jogging, swimming.
A person with big thighs is likely to have a kapha constitution in yoga terms. That means an earth mother type with broad hips and a heavier build. 'Women of the Kapha type have big thighs, full arms and big breasts, a little bit short and fat legs but their walk is graceful.' (Ayurveda Clinic Bankso)
The best action is to be as healthy and fit as you can. Look at what you eat. A tan can also do wonders for thighs. Tanned thighs can look sensational.
Also, get your legs in the air (no footwear). Do air cycling. Single legs cycling forward, then backward. Then try cycling with both legs together. Backwards and forwards. Having your legs in the air also draws blood and lymph from your feet and legs to get cleaned up and back into circulation. If you find it difficult to keep legs in the air, place them against a wall (with bottom touching the wall if possible) and do scissors. Opening and shutting legs.
Kaphas have enormous stamina. Being active is the key to keeping in shape. A curvy shape.