Hi LesleyB. Not everyone goes on excursions - some folk explore on their own & some stay on the ship. The tour buses drop you off where they pick up at ship although some ports give the option of getting off in the town centre & making your own way back to the ship either on foot or on the shuttle bus if one is provided. On return to the ship we usually go for lunch (if it's a half day excursion) & afterwards there will be some activities which are listed in the ship's paper which you get the night before delivered to your cabin. Horizon (P & O's paper) lists activities throughout the day from early morning till late at night including the gym classes, dancing classes, lectures, quizzes, film times, deck game competitions, card & craft get together a etc. There will be plenty for you to do & most things you just turn up but again the paper will say if you need to book. Have a wonderful cruise.