From easy, low level, to challenging. There's something for everyone.
The Ullswater Way
The Ullswater Way, as well as giving you superb views of the lake itself, allows many options.
A stroll along the shore path from Patterdale to Silver Bay and back is very popular. Another option is to take the Steamer ( ferry ) to Howtown and walk back to Patterdale / Glenridding.
If you’re thinking of doing the whole thing, maybe check out the information here.