If you are going on holiday then you may want to participate in a few excursions whilst there. The types of trips offered range quite drastically depending on where you are and what time of year you go. If you go to a place out of peak season you may find that there are limited trips available but the ones that are open often have some pretty amazing deals on offer.
It can be very common in some countries to be constantly stopped on the street by people wanting to sell you tours and day trips. This can become annoying after a time and you may even find yourself crossing the road to avoid them. If you do stop and talk, you will probably be given the hard sales talk and they will try to convince you to book any trips you wish to go on through them rather than your tour guide. They can very often offer you a better price that booking direct with the tour operators but you may not get as good experience and if there are any problems it is often harder to sort them out. Tour operators are there to make sure that your holiday is enjoyable and they will often go above and beyond to ensure this.