There are no established tipping guidelines for all cruises, you should decide the amount to tip your guide and crew based on your level of satisfaction with the services provided on board and while on excursions.
On Luxury and First class cruises it is recommended to tip $15-$20 p.p. for the guide per day and the same amount per day for the whole crew. On Midrange and Economy class cruises it is recommended to tip $10-$13 p.p. for the guide per day and the same amount per day for the whole crew.
Some cruises do not allow small children on board, mainly for safety reasons as small yachts/catamarans have many open spaces and steep stairs that are not suitable for children to run around. Other cruises, especially the large vessels do accept small children on board and even have qualified guides and staff on board to make a magical experience for small children.
Most yachts/catamarans accept children over 8 years-old on board and offer special rates to children up to 11 years-old for cruises and flights as per availability and feasibility to accommodate a Family on board; with all cruises, it is required as pre-requisite to have parents sign a release form if travelling with children.
It depends especially on the level of comfort and facilities on board you are looking for:
In general, cruises include: accommodation in cabin with private facilities, guided excursions with professional Licensed bilingual guide, transfers within Galapagos (on cruise dates), Airport assistance, all meals on board while cruising, drinking water, tea, coffee.
Luxury and First class cruises also include usage of snorkeling equipment and most of them have sea-kayaks on board for guests. Some Luxury class cruises also include Wet suits and others and First class cruises have them available for rent on board.
Midrange and Economy class cruises have snorkeling equipment and Wet suits available for rent on board (in cash).