If you want to experience the beautiful landscape that Ubud has to offer the bike tour is the perfect way to do it. BOB and his crew are super friendly and accommodating.
From this half day I got to learn so much about Balinese culture, how they produce Luwak coffee and taste it (some say it's the best coffee in the world), see the amazing scenery and get a proper exercise (which I asked for). The day couldn't be much better than that!
PS. The lunch was delicious!