[tag:2dppyvbm]Paulu888[/tag:2dppyvbm], welcome to DoW forums. Your itinerary looks good but Day 8 will be very hectic. Here are my comments on your queries:
1. No, there is no bike rental company in Srinagar.
2. I’m not sure of the bus service from Srinagar but with 4 people you will be better off hiring a cab and sharing the expenses. It will cost you little less than 4,000 per person.
3. Yes but you will have to negotiate this with the rental company. Some companies allow this, others don’t. You will be charged extra for this ofcourse.