A few people have recently asked for advice on excursions in gibraltar.
Myself and Helen have visited quite a bit in the past 5 years (even getting married there) and this is what I have found.
We have looked to do the dolphin excursion but when speaking with a booking agent on 2 occasions we have been advised that the chances of seeing dolphins on that day. Was not too good, it may be just our bad luck, but did not fancy paying for just a basic boat trip. One other point is that they charge for infants regardless of age, Grace was only 12 months at the time and from experience this is the only company I have found charging for children so young.
In regards to the different options at the top of the rock there is obviously the cable car which charges £7.50 for a single journey and £9 for a return journey (it is a long walk back down, not sure why anyone would buy a single!!) this only entitles you to see the monkey enclosure and nothing else.
Other attractions at the top are St Michaels cave, the Great siege tunnels and the moorish castle which in my opinion are well worth doing. The cost of this with the cable car company is £19 for adults and £12 for children. This option involves quite a walk between the sites of around 3 miles for the round trip and it can be quite tiring as it is very hilly.
An alternative option is a minibus tour, there are numerous drivers touting for business at the border with gib/Spain, on the main street and also at the base of Europa point as you go up towards the cable cars (trying to take business from the cable cars). From memory the trip includes entry to the top of the rock and all the attractions mentioned above and costs around £15. The benefit with this is that you are taken to all the sites and there is minimal walking, the tour takes about 3 hours but if a group of 8 book the whole bus I'm sure the driver will negotiate. I'm sure there will be drivers on the dock trying to overcharge so it may be better to book at one of the other sites.
We did the trip in our own car and for entry for 2 adults and a car it came to about £20 for entry to all the attractions (£10 for the car and £5 per adult) So the minibus tour is quite reasonable.
A helpful website is
http://www.gibraltarinfo.gi/gibraltar-tickets.aspx which is for the cable car company but gives a good description of the different attractions
Hope this is of help.
If you have any queries please feel free to PM me
Paul