It's possible to blackride buses and trams (drivers don't check). The frequency of controllers is unknown.
You can borrow a free bicycle during summer (?April - October). You need to give your id/passport, fill some paperwork and give deposit of 20 EUR/CHF and you can use the bicycle for 4 hours. After that you need to pay some money per hour. One station is on the promenade of Quai du Mont Blanc. You need to return the bike at 19 - 21 in the evening to somewhere.
- Airline: Norwegian
- Jardins Botanique: there's a little island in the lake with bamboo all around.
Update: Jardins Botanique are fenced, so be prepared for jumping a (not too high) fence to get in.
An open option may be parc Barton - possibly further towards world trade center (OMC)
Permit mostly necessary. you buy a card for something like 20 francs, then pay 10 francs to the (quite central) office for each day you want to busk. but there is not much competition so one can earn enough money to make that price worth it. busking without a permit should be ok if you are just passing through.