There are many ways to save money in LaDigue! First check out the budget accom. on the official site
Having just spent a month there, a self catering accom close or in LaPasse is the best bet. If traveling with children forget renting bicycles, as for the same money you can have a taxi take you to almost anywhere on the island and return to take you back.
Ask for Mr. Alpha taxi He is super and if you tell him you will use only him you get better rates. There are a lot of accom that are listed as inland near LaPasse, these are usually a few minutes from beach & shops and a great value. Forget shopping at Gregiores and shop at B&M market, they have fresh fruit, veg & nearly all that you could ask for. The locals shop there! As for eating out the only place that was really good was the pizza place located near Gregories market, air/con good prices and great food.
Tarosa is OK also. For the most part self catering is the best, it is economical and in the evenings theres not much to do anyway.
The restaurant in Union Estate was pretty good, and should be
part of any trip to the estate, leave early see all of Source d Argent & estate have lunch and leave late. My favorite beach was a small beach just before the beach of LaOrangerie, good shade swimming even with low tide. Great snorkeling along the stone walls of LaOrangerie also. A taxi to Grand Anse and return is about 16$ & well worth it. Leave early, explore Grand Anse, Petite Anse, have lunch at restaurant leave about 5pm. Anse Coco & Petite involve a walk thru the forest, rocky, and not for people with problems walking in rough terrain. Waling shoes a must, no flip flops! At these 3 beaches swimming is not for everyone due to strong currents and BIG waves, no snorkeling and shade is way back from the beach. The trip to Ile d Coco is amazing & well woth the $, Snorkeling there is magical even in 1 ft. of water. Half day trip is enough. Best beaches in LaDigue are Union estate, LaPasse, and Anse Severe. The Ferry from Mahe is about 100$
I took La Belle Serafina for 16$ and really enjoyed it if you get seasick or don't like to rough it take the ferry. Try the fried banans, cheddar cheese and bitter lemon soda and Sey Beer available at all shops. The kiosks just north of the port in LaPasse have nice souveneirs and another shop on the back road near Chateau St. Cloud also. A walk on this back road is beautiful, you see much more than on a bicycle. If I can help in anyway please ask! Happy traveling!