If you stay in Buttermere I can highly recommend:
1. Scarth Gap to Ennerdale.
2. Push up that tongue of glacial moraine to your left, it’s called the Tongue, but not on every map.
3. Meet the path under Green Gable and follow it to your right.
4. Hack onto the top of Great Gable.
5. Amazing run down to the tarn.
6. Amazing run down to Borrowdale
7. Up Honister to the mine, then round the back of Fleetwith to another cracking decsent into Buttermere.
If you’re feeling frisky, between points 5 and 6 you could head up towards Scafell Pike and turn around when you’ve got as far as you think you can ride down.
There isn’t much better than the run from Sprinkling to Borrowdale, it’s miles and miles and miles of awesome.