My ideas are similar to what Cam has said and I try and plan them before the session so I know I have something nice to do after, or else I can get "stuck"and find it hard to initiate anything nice.
I usually go shopping, even just Window shopping in a mall as it's very distracting and I can just sit and watch people or look at pretty things I can't afford!
If you're having trouble generating ideas of what to do, try putting "pleasant activity list" into Google, a list should pop up on a website and you can print it off and circle the ones you like best, so it's an easy reference when you need it.
The link below let's you choose what you like from a big list and puts only the ones you like into a pdf which is handy!
http://www.thrivewellness.com.au/resources/activities/
Good luck with the therapy